SS Block Time Index Verification for NR Broadcast Channel Access
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Solution Overview
Problem
In 5G wireless communication systems, the lack of error detection for the NR-TSS in synchronization signal blocks leads to delays and incorrect initial access due to potential errors in time index detection, causing unnecessary overhead and delays in receiving system information.
Innovation Solution
A method involving scrambling of system information using a scrambling sequence generated based on the time index provided by the NR-TSS, allowing for error detection and ensuring accurate time index determination, thereby preventing delays and incorrect initial access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beam sweeping is used to transmit NR-PSS in different beams at different time instants, then coverage is improved and UEs at any position can receive synchronization signals, but synchronization delay increases and frame start detection becomes ambiguous
Solution Approach 1:
The patent embeds time index information in the SS block that indicates the temporal position within the SS burst set beforehand. This allows the UE to pre-determine frame start timing without waiting to receive and process multiple beam-swept signals, thus resolving the contradiction between achieving wide coverage through beam sweeping and maintaining fast synchronization.
2Measurement precision
If time index information is embedded in the SS block, then frame start timing can be determined accurately, but the complexity of the synchronization signal structure increases
Solution Approach 1:
The patent combines time index information with the existing SS block structure that already carries synchronization and system information. By merging the time indication function into the existing SS block framework rather than adding separate signaling, the solution achieves accurate frame start timing determination while minimizing structural complexity.
3Quantity of substance
If error detection is not implemented for NR-TSS, then overhead is reduced, but incorrect time index detection causes delays and incorrect initial access procedures
Solution Approach 1:
The patent implements error detection for the time index information embedded in the SS block. This feedback mechanism allows the UE to verify whether the received time index is correct, enabling early detection of errors and avoiding unnecessary delays and incorrect initial access procedures while maintaining reasonable overhead through efficient error detection coding.
Data Source
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Figure 2b
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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 (410) the information providing the time index, and receiving (430) the system information which comprises descrambling the system information using a scrambling sequence generated (420) based on the information providing the time index. The method also comprises determining (440) 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.