SSB Transmission Across Two Slots for NR-U LBT Reduction
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Solution Overview
Problem
In the context of new radio (NR-U) systems, transmitting four synchronization signal/PBCH blocks (SSBs) and corresponding remaining minimum system information (RMSI) within a single transmission duration is challenging due to the need for multiple listen before talk (LBT) operations, leading to increased power consumption and delay.
Innovation Solution
The method involves transmitting four SSBs and their corresponding RMSI across two continuous slots, allowing for simultaneous transmission within a single maximum transmitting duration, thereby reducing the number of LBT operations required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If four SSBs and corresponding RMSI are transmitted within a single transmission duration, then transmission efficiency is improved, but multiple LBT operations are required which increases power consumption and delay
Solution Approach 1:
The transmission of four SSBs and corresponding RMSI is segmented across two continuous slots instead of attempting to transmit all within a single slot. This segmentation allows the base station to complete the transmission of all four SSB groups without requiring multiple LBT operations, thereby reducing power consumption while maintaining transmission efficiency.
2Productivity
If four SSBs and corresponding RMSI are transmitted within a single transmission duration, then transmission efficiency is improved, but multiple LBT operations increase transmission delay
Solution Approach 1:
The transmission timeline is segmented into two continuous slots, allowing the base station to transmit four SSBs and their corresponding RMSI in an organized manner. This segmentation enables the completion of all transmissions within a single LBT operation window, eliminating the delay that would result from multiple LBT operations.
3Reliability
If LBT is performed multiple times to transmit four SSBs and RMSI, then reliable transmission is achieved, but the number of LBT operations increases system complexity
Solution Approach 1:
The transmission resources are segmented into two continuous slots, which allows the base station to transmit all four SSBs and corresponding RMSI under a single LBT operation. This approach maintains transmission reliability by ensuring complete delivery of all synchronization signals and system information, while simultaneously reducing system complexity by eliminating the need for multiple LBT operations and their associated coordination mechanisms.
Data Source
AI summary
A synchronization signal/PBCH block (SSB) transmission method. The method includes: transmitting, in two continuous slots, four synchronization signal/PBCH blocks (SSBs) and remaining minimum system information (RMSI) corresponding to the four SSBs respectively.