SSB Mapping for Beam Ambiguity in NR Systems
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Solution Overview
Problem
In communication systems using higher frequency bands, such as the new radio (NR) system, transmitting and receiving multiple synchronization signal blocks (SSBs) in a wide band poses challenges due to ambiguity in beam information and time synchronization, especially when SSBs are multiplexed in the frequency domain and transmitted through different beams.
Innovation Solution
The method involves a terminal receiving SSBs from a base station, using mapping relationship information to identify the correct SSB index and beam information, and acquiring time synchronization. This is achieved by signaling SSB candidate indexes and their corresponding SSB indexes, allowing the terminal to differentiate between SSBs transmitted through different beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SSBs are multiplexed in the frequency domain and transmitted through different beams, then the coverage and capacity of the communication system are improved, but ambiguity in beam information and time synchronization occurs in the terminal
Solution Approach 1:
The patent segments the SSB transmission by introducing frequency position-specific mapping relationships between SSB candidate indexes and SSB indexes. Each frequency position has its own mapping relationship, allowing the terminal to identify which SSB index corresponds to which frequency position and beam, thereby eliminating beam information ambiguity while maintaining multi-beam coverage
Solution Approach 2:
The patent introduces mapping relationship information as an intermediary between the SSB candidate indexes and SSB indexes. This mapping relationship, which is specific to each frequency position, acts as a mediator that helps the terminal correctly associate SSB indexes with their corresponding beams and frequency positions, resolving the information ambiguity
2Measurement precision
If multiple SSBs are multiplexed in the frequency domain with different SSB indexes, then time synchronization can be achieved, but ambiguity in beam information occurs in the terminal
Solution Approach 1:
The patent applies local quality by making the mapping relationship between SSB candidate indexes and SSB indexes specific to each frequency position. Each frequency position has its own localized mapping relationship, allowing the terminal to correctly interpret SSB indexes in the context of the specific frequency position, thereby maintaining time synchronization while resolving beam information ambiguity
3Loss of information
If multiple SSBs are multiplexed in the frequency domain with the same SSB index, then beam information can be identified, but ambiguity in time synchronization occurs in the terminal
Solution Approach 1:
The patent resolves the contradiction by adding the frequency position dimension to the mapping relationship. Instead of having a single mapping relationship, the system now has mapping relationships that are differentiated by frequency position. This dimensional addition allows SSBs with the same index to be associated with different frequency positions and beams, while the SSB candidate indexes maintain their time synchronization function
Data Source
AI summary
A method of a terminal may include: receiving, from a base station, a first SSB having an SSB candidate #n at a first frequency position during a first time period; receiving, from the base station, first mapping relationship information between SSB candidate indexes and SSB indexes; identifying an SSB #k mapped to the SSB candidate #n based on the first mapping relationship information for the first frequency position; acquiring time synchronization with respect to the base station based on the SSB candidate #n; and obtaining beam information for the first frequency position based on the SSB #k, wherein each of n and k is an integer equal to or greater than 0.