SS Block Time Index Verification for NR Broadcast Channels
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Solution Overview
Problem
In 5G wireless communication systems, the transmission of system information in synchronization signal blocks faces challenges due to errors in detecting the NR-TSS, leading to delays and unnecessary overhead in the initial access procedure.
Innovation Solution
A method is introduced where system information is multiplexed with a time index in an SS block, and the system information is scrambled using a scrambling sequence generated based on the time index. This allows the wireless device to determine the accuracy of the time index using an error-detection code, thereby reducing delays and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information is transmitted in SS blocks with beam sweeping, then coverage and reliability are improved, but synchronization delay increases because multiple NR-PSS transmissions are required
Solution Approach 1:
The patent applies preliminary action by transmitting the time index information in the NR-TSS before the actual system information transmission. This allows the UE to预先 know which SS block it is receiving and to prepare for correct system information decoding, thereby reducing the overall access delay while maintaining reliable beam sweeping coverage
2Productivity
If NR-TSS is transmitted without error-detection code to reduce overhead, then transmission efficiency is improved, but detection accuracy deteriorates
Solution Approach 1:
The patent uses the system information as an intermediary to indirectly verify the NR-TSS detection accuracy. The UE uses the received time index to descramble and decode the system information, then performs error detection on the system information. If the system information passes error detection, it confirms the time index is correct, thereby verifying NR-TSS detection accuracy without adding direct error-detection codes to NR-TSS
3Reliability
If UE performs error detection on received system information, then reliability of time index verification is improved, but processing complexity increases
Solution Approach 1:
The patent applies universality by using the existing error detection mechanism (CRC) of system information for the additional purpose of verifying time index accuracy. The same error detection code that protects system information integrity is also used to confirm correct time index reception, eliminating the need for separate verification mechanisms and keeping processing complexity manageable
Data Source
AI summary
The disclosure relates to a method performed by a wireless device, for receiving system information from a network node of a wireless communication system. The system information is received in a synchronization signal (SS) block of an SS burst set comprising at least one SS block. The system information is multiplexed with information providing a time index indicating which SS block of the SS burst set that is being received. The method comprises receiving the information providing the time index, and receiving the system information, which comprises descrambling the system information using a scrambling sequence generated based on the information providing the time index. The method also comprises determining an accuracy of the information providing the time index, based on an error-detection code related to the received system information. The disclosure also relates to corresponding network node method and apparatus.