IAB Node Timing Offset Compensation in NR Networks
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Solution Overview
Problem
In new radio (NR) systems with integrated access and backhaul (IAB) technology, accurately determining transmission timing between nodes is complex due to timing offsets, leading to interference and reduced transmission efficiency.
Innovation Solution
A timing determination method and device that calculate transmission timing by determining a timing parameter, including time differences between downlink and uplink timings, to align transmission timings accurately across nodes, thereby improving synchronization and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If transmission timing is determined simply by advancing DRT by TA/2, then the determination process is simple, but transmission timing alignment between nodes becomes inaccurate due to timing offsets
Solution Approach 1:
The patent introduces a feedback mechanism where the parent node measures the actual timing offset between its uplink receive timing and downlink transmit timing, then feeds back this timing offset information to the IAB node. The IAB node uses this feedback to adjust its transmission timing calculation from a simple TA/2 advance to a more accurate calculation that compensates for the measured offset, thereby resolving the contradiction between simplicity and accuracy.
Solution Approach 2:
The patent replaces the mechanical assumption of perfect timing alignment (where TA/2 would be sufficient) with an electronic measurement and compensation system. Instead of relying on theoretical timing relationships, the system electronically measures actual timing offsets and uses software-based calculations to determine corrected transmission timing, substituting the simple mechanical timing advance method with a more sophisticated electronic control approach.
2Device complexity
If transmission timing is not accurately determined, then the system operation is simple, but mutual interference between nodes occurs reducing transmission efficiency
Solution Approach 1:
The patent applies preliminary action by having the parent node measure and determine the timing offset before the IAB node performs transmission. The timing offset information is fed back in advance, allowing the IAB node to pre-calculate the correct transmission timing adjustment. This preliminary determination prevents interference by ensuring accurate timing alignment before actual data transmission occurs, resolving the contradiction between operational simplicity and transmission efficiency.
3Measurement precision
If timing offset compensation is implemented, then transmission timing alignment accuracy is improved, but the determination process becomes more complex
Solution Approach 1:
The patent introduces timing offset feedback information as an intermediary element that mediates between the parent node's timing measurements and the IAB node's transmission timing determination. This intermediary carries the essential correction data without requiring complex direct coordination or synchronization mechanisms between nodes, simplifying the overall system while achieving accurate timing alignment through the feedback channel.
Data Source
AI summary
Provided are a timing determination method and device, a communication node and a storage medium. The timing determination method includes: determining a timing parameter; and determining transmission timing of a target node according to the timing parameter, where the transmission timing includes at least one of a time difference between first timing and second timing, downlink transmit timing (DTT) or uplink transmit timing (UTT).