NR Random Access Signal Slot Format Configuration for Unlicensed Bands
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Solution Overview
Problem
Current studies have not adequately addressed the random access method in New Radio (NR) for unlicensed bands, particularly in reducing the impact of Listen Before Talk (LBT) results on performance, leading to potential transmission failures and decoding issues in NR systems.
Innovation Solution
A transmission apparatus and method that configures a slot format for random access signals in NR, allowing for simultaneous or sequential transmission of preamble and data parts, with the data part being transmitted before or after the preamble, to mitigate the effects of LBT results, ensuring proper decoding and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random access signals are transmitted in unlicensed bands using conventional methods, then initial connection from terminal to base station can be established, but transmission failures and decoding issues occur due to LBT results
Solution Approach 1:
The patent applies dynamics by making the slot format configurable and adaptable based on LBT results. The base station can dynamically switch between different slot formats (first format with data before preamble, second format with preamble before data) depending on the LBT outcome, allowing the system to optimize transmission reliability under varying channel conditions in unlicensed bands
Solution Approach 2:
The patent changes the parameter of slot format configuration based on LBT results. When LBT succeeds, one format is used; when LBT fails, a different format is applied. This parameter change approach allows the system to mitigate the harmful effects of LBT by adapting the transmission structure to the actual channel state
2Reliability
If data section is transmitted before preamble section, then decoding can be improved under certain LBT conditions, but transmission format complexity increases
Solution Approach 1:
The patent uses dynamics by implementing multiple configurable slot formats that can be selected based on LBT results. The base station maintains a set of pre-defined formats (first format with data before preamble, second format with preamble before data) and dynamically selects the appropriate format, managing complexity through structured configuration options rather than ad-hoc adjustments
3Reliability
If flexible slot formats are configured based on LBT results, then transmission reliability in unlicensed bands is improved, but control signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple slot formats in advance at the base station. The formats are prepared beforehand and simply selected based on LBT results, rather than generating complex control information dynamically. This reduces signaling overhead by using pre-established configuration templates
Data Source
AI summary
The present invention provides a terminal capable of suitably performing random access processing. In a terminal (100), a RACH resource determination unit (104) determines the format of a random access signal on the basis of a parameter related to the transmission of the random access signal, which includes a preamble part and a data part. A wireless transmission unit (109) transmits the random access signal on the basis of the format.