Terminal Random Access Preamble Transmission Timing Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Spectrum sharing between LTE and NR systems poses a challenge in suppressing interference, particularly when NR uplink transmissions coincide with LTE downlink receptions.
Innovation Solution
A terminal is configured to receive an index specifying configuration information for transmitting a random access preamble and additional information specifying a time domain resource. The terminal replaces the original time domain resource with the specified resource if the index falls within a specific numerical range, thereby adjusting the transmission timing to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NR uplink transmission is performed at the same timing as LTE downlink reception, then NR data transmission rate is improved, but interference on LTE downlink reception increases
Solution Approach 1:
The patent applies preliminary action by configuring the terminal with an index value in advance that specifies the time domain resource for random access preamble transmission. This pre-configuration allows the terminal to select appropriate transmission timing that avoids LTE downlink reception periods, preventing interference before it occurs. The base station provides the index through configuration information, and the terminal uses this index to determine the correct time domain resource, thereby proactively avoiding the interference problem rather than reacting to it after occurrence.
2Object-affected harmful factors
If random access preamble transmission timing is adjusted to avoid LTE downlink, then interference on LTE system is reduced, but random access procedure complexity increases
Solution Approach 1:
The patent applies parameter changes by using an index value to specify different time domain resources for random access preamble transmission. Instead of complex timing calculations or multiple configuration parameters, the system changes the approach by introducing a simplified index parameter that directly maps to appropriate time domain resources. This index-based configuration reduces the complexity of the random access procedure while ensuring that preamble transmission occurs at timing that avoids LTE downlink reception, thus reducing interference.
3Productivity
If spectrum sharing between LTE and NR systems is implemented, then frequency resource utilization is improved, but interference management difficulty increases
Solution Approach 1:
The patent applies segmentation by dividing the time domain resources into distinct segments based on the index value. The time domain resources for random access preamble transmission are segmented into different periods or occasions, where each segment corresponds to a specific index value. This segmentation allows the system to implement spectrum sharing between LTE and NR systems while managing interference through structured time domain separation. The base station configures the appropriate index that points to specific time domain segments, enabling organized resource allocation that reduces interference management complexity.
Data Source
AI summary
A terminal includes a receiver that receives an index that specifies configuration information for transmitting a random access preamble; and a controller that configures, when the receiver receives additional information that specifies a time domain resource for transmitting the random access preamble and the index falls within a specific numerical range, the time domain resource specified by the additional information, the time domain resource being configured by replacing a time domain resource for transmitting the random access preamble included in the configuration information specified by the index with the time domain resource specified by the additional information.