TRS Burst Transmission in NR-U Systems
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Solution Overview
Problem
There is no established method for tracking reference signal (TRS) burst transmission in new radio unlicensed (NRU) frequency band systems, which hinders precise time-frequency synchronization and data reliability.
Innovation Solution
A TRS burst transmission method where the transmit end sends the first TRS burst at the start of the maximum channel occupancy time (MCOT) and optionally a second TRS burst Y slots later, allowing the receive end to achieve precise synchronization without explicit indication of the TRS burst slot, thereby reducing signaling overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the transmit end sends TRS bursts at fixed positions in each MCOT, then the receive end can achieve precise time-frequency synchronization and reduce signaling overheads, but the system requires establishing a new TRS burst transmission method in the NRU system
Solution Approach 1:
The patent applies preliminary action by pre-defining the TRS burst transmission positions at fixed slots (e.g., first slot and a slot Y slots later) within each MCOT. This allows the receive end to expect and parse TRS bursts at these predetermined positions without requiring dynamic signaling, thereby achieving precise time-frequency synchronization while avoiding the complexity of establishing new transmission methods.
2Reliability
If the transmit end sends multiple TRS bursts in a long MCOT, then the reliability of data receiving is improved, but the signaling overheads increase
Solution Approach 1:
The patent applies periodic action by transmitting TRS bursts at regular intervals (fixed slot positions) within each MCOT. This periodic transmission pattern ensures that the receive end can maintain reliable time-frequency synchronization throughout the MCOT duration without requiring excessive signaling, as the fixed pattern is inherently predictable and requires minimal indication information.
3Adaptability or versatility
If the transmit end indicates the slot for sending TRS bursts to the receive end, then the flexibility of transmission is improved, but the signaling overheads increase
Solution Approach 1:
The patent extracts the need for dynamic slot indication by fixing the TRS burst transmission positions at predetermined slots within each MCOT. This eliminates the requirement for the transmit end to signal specific slot positions to the receive end, thereby reducing signaling overheads while maintaining sufficient transmission flexibility through the fixed pattern design.
Data Source
AI summary
A tracking reference signal (TRS) burst transmission method and apparatus wherein a transmit end determines to send a first TRS burst in the first slot in a maximum channel occupancy time (MCOT), that is, the TRS burst is sent at a start moment of the MCOT, so that a receive end can obtain precise time-frequency synchronization as soon as possible. In addition, when a length of a first MCOT is greater than Y slots, in addition to sending the first TRS burst in the first slot in the MCOT, it is further determined to send a second TRS burst in a slot that is in the first MCOT and whose distance to a start slot of a previous TRS burst is Y slots, to improve effectiveness of the time-frequency synchronization and further improve the reliability of receiving the data at the receive end.