5G NR Synchronization Signal Mapping Using Fixed Numerology
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Solution Overview
Problem
In the 5GNR communication system, the complexity of blind detection for synchronization signals and broadcast channels is high due to flexible subcarrier spacing and cyclic prefix lengths, making it challenging to transmit these signals using a carrier with a non-fixed numerology.
Innovation Solution
The method involves mapping synchronization signals and broadcast channels to preset time-frequency resource blocks using a fixed numerology, which carries configuration information for the initial access subband, allowing user equipment to detect the downlink control channel and access other subbands, thereby reducing detection complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible numerology configuration is used in 5GNR system, then adaptability for different application scenarios is improved, but blind detection complexity increases
Solution Approach 1:
The patent segments the carrier into multiple subbands, with the first subband using a fixed numerology for synchronization signal transmission and other subbands using flexible numerologies for different application scenarios. This segmentation allows the UE to perform blind detection only on the first subband with fixed parameters, reducing detection complexity while maintaining adaptability in other subbands.
Solution Approach 2:
The patent applies different numerology characteristics to different subbands: the first subband uses fixed numerology parameters to reduce detection complexity, while other subbands use flexible numerology configurations to maintain adaptability for various application scenarios such as eMBB and URLLC.
2Device complexity
If fixed numerology is used for synchronization signal, then blind detection complexity is reduced, but carrier mapping flexibility is limited
Solution Approach 1:
The patent divides the carrier into multiple subbands with different numerology configurations. The first subband uses fixed numerology for synchronization signal transmission to reduce detection complexity, while other subbands maintain flexible numerology mappings for different applications, thus resolving the contradiction between fixed and flexible carrier mapping.
Solution Approach 2:
The first subband with fixed numerology acts as an intermediary that facilitates UE access to the carrier. By providing a standardized entry point with fixed parameters, it enables UEs to synchronize and access the network without requiring blind detection across all possible numerologies, while still allowing flexible numerology usage in other subbands.
Data Source
AI summary
A method for transmitting information in a communication system, a base station, and a user equipment. The method includes mapping a synchronous signal and a broadcast channel to be transmitted to preset one or more time-frequency resource blocks in a target carrier, where a numerology used by the target carrier is a first numerology group, and the first numerology group includes any one or more numerologies that are allowed to be used by the target carrier; the one or more time-frequency resource blocks are located within an initial access subband of the target carrier and uses a second numerology, where the second numerology is a fixed numerology; the broadcast channel carries at least configuration information of the initial access subband; and the initial access subband is a subband corresponding to a numerology in the first numerology group; and transmitting the one or more time-frequency resource blocks to a user equipment.