Rate Matching Indication for SSB Transmission in NR-U
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Solution Overview
Problem
In New Radio Unlicensed (NR-U) systems, base stations face challenges in simultaneously sending four Synchronization Signal Blocks (SSBs) and corresponding Minimum System Information (RMSI) within the 1 ms time frame required for Listen Before Talk (LBT), leading to increased power consumption and system performance degradation.
Innovation Solution
The proposed solution involves sending the four SSBs and corresponding RMSI in two consecutive time slots, with each SSB and its associated RMSI being transmitted using a specific rate matching mode that deduces time-frequency resources, allowing for efficient use of resources and reduced LBT frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If four SSBs and corresponding RMSI are sent within 1 ms time frame, then initial access speed is improved, but power consumption increases and system performance degrades
Solution Approach 1:
The patent divides the transmission of four SSBs and corresponding RMSI into two consecutive time slots instead of attempting to transmit all within a single 1 ms frame. This segmentation allows the base station to perform LBT twice, once for each time slot, thereby reducing the total LBT frequency and power consumption while still achieving complete initial access within the required time window.
2Speed
If four SSBs and corresponding RMSI are sent within 1 ms time frame, then initial access speed is improved, but system performance degrades
Solution Approach 1:
The patent segments the transmission process into two time slots, which improves system performance by reducing the complexity of coordinating four SSBs and their corresponding RMSI within a single slot. This segmentation allows for more reliable resource allocation and reduces the likelihood of transmission failures, while still maintaining fast initial access.
3Reliability
If LBT is performed frequently to send four SSBs and RMSI, then transmission reliability is improved, but time consumption increases
Solution Approach 1:
The patent segments the transmission into two time slots, with each slot containing two SSBs and their corresponding RMSI. This segmentation allows the base station to perform LBT twice instead of four times, reducing the total time spent on LBT procedures while maintaining transmission reliability. Each time slot operates independently, allowing parallel processing of LBT operations.
4Productivity
If rate matching mode deducts time-frequency resource occupied by SSB 1, then resource utilization is improved, but complexity of resource allocation increases
Solution Approach 1:
The patent employs preliminary action by pre-configuring the rate matching mode in the first SSB, which indicates to the terminal device that time-frequency resources occupied by the second SSB should be deducted. This pre-indication simplifies the resource allocation process at the terminal side, as the terminal can directly apply the indicated mode without complex calculations, thereby improving resource utilization while keeping device complexity manageable.
Data Source
AI summary
A rate matching indication method is provided. The method includes: a base station sends a synchronization signal block SSB 0 and a synchronization signal block SSB 1 in a time slot, where the SSB 0 carries a first indication, and the first indication indicates, to a terminal, the use of a rate matching manner that deducts time-frequency resources occupied by the SSB 1.