NR Broadcast Channel Scrambling for SS Block Time Index Verification
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Solution Overview
Problem
In the context of 5G NR wireless communication, the detection of the NR-TSS for determining the boundary of SS burst or SS burst set is prone to errors without a CRC, leading to incorrect system information delivery and delays in the initial access procedure.
Innovation Solution
Scrambling the system information of NR-PBCH with a pseudo-random sequence generated based on the time index provided by NR-TSS, allowing early verification of detection accuracy through CRC checks.
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, but synchronization delay increases and frame start detection becomes ambiguous
Solution Approach 1:
The patent applies preliminary action by transmitting the NR-TSS (tertiary synchronization signal) before the actual frame start to provide advance timing information. This allows the UE to know the frame boundary in advance, eliminating the ambiguity caused by beam sweeping and enabling proper timing for receiving subsequent system information without increasing overall synchronization delay.
Solution Approach 2:
The NR-TSS acts as an intermediary signal between the NR-PSS (primary synchronization signal) and the frame data transmission. It mediates the timing relationship by providing a reference point that helps the UE determine the frame start position even when NR-PSS transmissions are spread across different beams and time instants.
2Quantity of substance
If NR-TSS is transmitted without error detection, then overhead is reduced, but detection accuracy cannot be verified leading to incorrect initial access
Solution Approach 1:
The patent implements feedback by using the CRC (Cyclic Redundancy Check) of the system information to verify the accuracy of the NR-TSS detection. The UE uses the detected time index from NR-TSS to determine when to expect system information, then verifies whether the received system information is correct by checking its CRC. This feedback mechanism allows error detection without adding direct overhead to the NR-TSS itself.
Data Source
Figure 1~2a
Figure 2b
Figure 2c
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 (430) the system information which comprises descrambling the system information using a scrambling sequence generated (420) based on the time index. The method also comprises determining (440) whether the information providing the time index is accurate, based on an error-detection code related to the received system information. The disclosure also relates to corresponding network node method and apparatus.