Synchronization Signal Block Location Indication in 5G NR
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Solution Overview
Problem
In the 5G new radio (NR) access system, effectively indicating the location of a synchronization signal block is challenging due to the use of multiple synchronization signal blocks within a single transmission period, which hinders time synchronization and radio frame structure determination for terminal devices.
Innovation Solution
The method involves generating a synchronization signal block with a sequence number indicated using sequence number indication information, scrambling code, cyclic redundancy check (CRC) mask, bijective transformation parameter, cyclic shift information, and system frame number, allowing the location of the synchronization signal block to be effectively identified within a plurality of blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple synchronization signal blocks are transmitted in a polling manner using beamforming, then the coverage and reliability of synchronization signal transmission are improved, but the complexity of indicating the location of synchronization signal blocks increases
Solution Approach 1:
The location indication is segmented into two parts: a first part indicating the index of the synchronization signal block within an SS burst set, and a second part indicating the index of the SS burst set within a system frame. This segmentation allows complex location information to be divided into manageable components that can be independently encoded and transmitted
Solution Approach 2:
The location indication transitions from a two-dimensional concept (time and frequency resources) to a one-dimensional sequence number by mapping the two-part indication onto a single sequential identifier. This dimensionality reduction simplifies the indication mechanism while maintaining the ability to uniquely identify synchronization signal blocks across multiple beams and time instances
2Measurement precision
If the sequence number of synchronization signal block is explicitly indicated in the broadcast signal, then the location indication accuracy is improved, but the broadcast signal resource consumption increases
Solution Approach 1:
Instead of transmitting the complete sequence number explicitly in the broadcast signal, only a portion of the sequence number information is transmitted. The terminal device infers the remaining part based on predefined relationships and its own detection results, reducing broadcast signal overhead while maintaining accurate location indication
Solution Approach 2:
The patent introduces an intermediary mapping relationship between the transmitted indication information and the actual sequence number. This mapping acts as a mediator that allows compact representation of location information in the broadcast signal while enabling the terminal to reconstruct the full sequence number through predefined transformation rules
Data Source
AI summary
This application provides a signal transmission method and apparatus. The method includes: generating a synchronization signal block, where the synchronization signal block includes a synchronization signal and a broadcast signal, a sequence number of the synchronization signal block is indicated by using at least one of sequence number indication information carried in the broadcast signal, a scrambling code of the broadcast signal, a cyclic redundancy check CRC mask of the broadcast signal, a bijective transformation parameter of the broadcast signal, cyclic shift information of the broadcast signal on which channel coding has been performed, and a system frame number carried in the broadcast signal, and the sequence number indicates a location of the synchronization signal block in a plurality of synchronization signal blocks; and sending the synchronization signal block.