Synchronization Signal Block Group Indication for NR Cell Synchronization
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Solution Overview
Problem
In New Radio (NR) communication systems, user equipment (UE) faces challenges in identifying and synchronizing with cells due to varying quantities of synchronization signal blocks (SSBs) transmitted in a burst set, which can be less than the maximum, necessitating effective indication methods to ensure successful reception.
Innovation Solution
A synchronization signal block indication method is introduced, where a network device generates and sends a message with synchronization signal block group indication information and synchronization signal block indication information, using bitmap information to consistently indicate the presence of SSBs within SSB groups, allowing terminal devices to determine all sent SSBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the maximum quantity L of synchronization signal blocks is transmitted in a synchronization signal burst set, then the coverage and synchronization capability are improved, but the signaling overhead and resource consumption increase
Solution Approach 1:
The patent divides the maximum L synchronization signal blocks into multiple groups, where only a subset of groups are actually transmitted. Each group contains a portion of the total SSBs, allowing the network to selectively activate specific groups based on coverage requirements while maintaining the ability to indicate up to L total blocks through group-level signaling.
Solution Approach 2:
Instead of always transmitting all L synchronization signal blocks, the system transmits only the necessary subset (less than L) while using indication information to specify which blocks are present. This partial action reduces resource consumption while maintaining sufficient synchronization coverage.
2Quantity of substance
If the quantity of transmitted synchronization signal blocks is reduced to less than L, then the resource consumption is reduced, but the terminal device's ability to identify and synchronize with the cell deteriorates
Solution Approach 1:
The network device transmits indication information in advance that specifies which synchronization signal blocks are actually transmitted. This preliminary indication allows the terminal device to know beforehand which blocks to expect and process, ensuring reliable cell identification even when fewer than L blocks are transmitted.
Solution Approach 2:
The patent introduces indication information as an intermediary element that bridges the gap between reduced SSB transmission and maintained synchronization reliability. This indication message acts as a mediator that guides the terminal device to correctly identify and process the actual transmitted blocks among the possible L blocks.
3Reliability
If indication information is sent to notify the terminal device of actually transmitted synchronization signal blocks, then the reception success rate is improved, but the signaling overhead increases
Solution Approach 1:
The patent introduces a new dimension of group-level indication to efficiently convey information about multiple SSBs. Instead of individually indicating each transmitted block, the system uses group identifiers and quantity information to compactly represent the transmission pattern, reducing signaling overhead while maintaining complete information for reception success.
Data Source
AI summary
Embodiments of the present invention provide a synchronization signal block indication method, a synchronization signal block determining method, a network device, and a terminal device. The method includes: generating, by a network device, a synchronization signal block indication message, where the synchronization signal block indication message includes synchronization signal block group indication information which is used to indicate an synchronization signal block group sent by the network device, and synchronization signal block indication information is used to indicate an synchronization signal block sent by the network device in each synchronization signal block group, and locations of a synchronization signal block sent by the network device in synchronization signal block groups sent by the network device are the same; and sending, by the network device, the synchronization signal block indication message.