SS Block Time Index Checking in NR Broadcast Channel Reception
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Solution Overview
Problem
In 5G wireless communication systems, the lack of error-detection mechanisms for the NR-TSS in synchronization signal blocks leads to delays and incorrect initial access procedures due to potential errors in detecting the time index, which is crucial for synchronizing with the network and decoding 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 early accuracy checking of the received time index through error-detection codes, thereby preventing unnecessary delays and ensuring correct initial access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error-detection mechanisms are added for NR-TSS in synchronization signal blocks, then reliability of time index detection is improved, but device complexity increases
Solution Approach 1:
The patent combines the error-detection function with the existing system information transmission by using the same physical resources (PBCH) to carry both system information and error-detection codes for the time index. This merging approach allows reliability improvement without adding separate dedicated error-detection channels or mechanisms, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent introduces an intermediary mechanism where the system information itself serves as a carrier for error-detection capability. By embedding error-detection codes within the system information transmission framework, the patent achieves reliable time index verification without requiring a completely separate error-detection system, thus balancing reliability improvement with complexity management.
2Adaptability or versatility
If beam sweeping with multiple NR-PSS transmissions is implemented, then coverage and synchronization capability are improved, but time synchronization accuracy deteriorates due to different offsets relative to frame start
Solution Approach 1:
The patent applies preliminary action by transmitting the time index information (indicating which SS block of the SS burst set is being transmitted) before the actual system information that requires accurate timing. This allows the UE to first acquire the time index, use it to generate the correct scrambling sequence, and then accurately decode the subsequent system information with proper frame synchronization, even when receiving signals through beam sweeping with different time offsets.
Solution Approach 2:
The patent implements a feedback mechanism where the time index information provides feedback about the temporal position of the SS block within the SS burst set. This feedback enables the UE to adjust its timing reference and generate appropriate scrambling sequences that account for the beam sweeping time offsets, thereby maintaining synchronization accuracy despite the multi-beam transmission structure.
3Reliability
If scrambling sequence is generated based on time index information, then error detection capability is improved, but processing time increases
Solution Approach 1:
The patent uses preliminary action by having the UE generate the scrambling sequence immediately upon receiving and decoding the time index information, before attempting to decode the system information. This preliminary generation of the correct scrambling sequence based on the time index enables efficient error detection during the subsequent system information decoding process, rather than requiring iterative or post-processing error detection methods that would consume more time.
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.