Random Access Message Timing Offset for Millimeter Wave Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-frequency wireless communication systems, particularly at millimeter wave frequencies above 52.6 GHz, the use of beamforming and multiple TRPs with small beams complicates timing synchronization and beam selection, leading to ambiguities in determining the exact symbol timing and cyclic prefix duration, which affects the reception of random access messages.
Innovation Solution
The method involves shifting the random access message relative to the transmission timing grid, allowing for optimized FFT window positioning and improved timing synchronization by shifting the beginning of the message relative to the symbol time interval, enabling correct symbol-level timing determination even in systems with high subcarrier spacings and short symbol time intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming and multiple TRPs with small beams are used in high-frequency wireless communication, then communication capacity and spectral efficiency are improved, but timing synchronization complexity and beam selection ambiguities increase
Solution Approach 1:
The patent applies preliminary action by having the wireless device transmit the random access message at a predetermined time offset relative to the downlink signal reception time. This pre-calculated timing offset compensates for the round-trip delay and beamforming processing time, allowing the network node to correctly identify and synchronize with the uplink message without complex real-time timing adjustments.
Solution Approach 2:
The patent uses a time offset as an intermediary parameter to bridge the timing discrepancy between downlink signal reception and uplink message transmission. This time offset acts as a mediator that aligns the timing grids of the wireless device and network node, enabling proper synchronization despite the complexities introduced by beamforming and multiple TRPs.
2Productivity
If high subcarrier spacings and short symbol time intervals are used, then spectral efficiency is improved, but timing determination accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and using a predetermined time offset for message transmission. This approach ensures that even with short symbol time intervals and high subcarrier spacings, the timing information can be accurately determined because the offset is established in advance based on the known relationship between downlink reception and uplink transmission timing.
Solution Approach 2:
The patent employs feedback mechanisms where the network node receives the random access message with the predetermined time offset applied, and this feedback information is used to determine accurate timing. The time offset acts as a reference that enables the network to correctly identify symbol boundaries and maintain timing synchronization despite the shortened symbol durations.
3Adaptability or versatility
If the random access message is transmitted at the standard timing grid, then protocol compliance is maintained, but reception accuracy under beamforming conditions deteriorates
Solution Approach 1:
The patent maintains protocol compliance by using a predetermined time offset that is calculated based on standard timing relationships. This pre-calculated offset ensures that the transmission timing remains within the expected protocol framework while simultaneously achieving accurate reception under beamforming conditions, thus satisfying both protocol requirements and technical performance needs.
Solution Approach 2:
The patent changes the timing parameter by introducing a predetermined time offset relative to the standard timing grid. This parameter modification allows the system to adapt to beamforming-induced timing variations while maintaining overall protocol compliance. The time offset adjusts the transmission timing to account for the additional processing and propagation delays introduced by beamforming operations.
Data Source
AI summary
There is disclosed a method of operating a wireless device in a wireless communication network, the wireless device being configured with a transmission timing grid. The method includes transmitting a random access message with a timing shifted relative to the transmission timing grid, wherein a border in time domain of the transmitted random access message is shifted relative to a border in time domain of a symbol time interval of the transmission timing grid. The disclosure also pertains to related devices and methods.