5G NR SSB Time Offsets for Low-SINR Cell Overlap
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Solution Overview
Problem
In 5G NR cellular networks, SSBs from adjacent cells interfere due to simultaneous transmission on the same time and frequency resources, leading to degraded SNR at User Equipment (UE) devices in overlapping coverage areas.
Innovation Solution
SSBs from adjacent cells are transmitted at different time slots using non-overlapping or minimally overlapping frequency resources, reducing SSB-to-SSB interference and improving SINR at UE devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SSBs are transmitted on the same time and frequency resources from adjacent cells, then resource utilization is maximized, but SSB-to-SSB interference occurs causing degraded SINR at UE devices
Solution Approach 1:
The patent segments the SSB transmission timeline by introducing time offsets between adjacent cells. Each cell transmits its SSB at a different time slot, dividing the simultaneous transmission into sequential transmissions. This segmentation eliminates the harmful interference while maintaining efficient resource utilization across the network.
Solution Approach 2:
The patent implements periodic SSB transmissions with configured time offsets. Cells transmit SSBs periodically at different times according to a configured offset pattern, creating a periodic action sequence that prevents simultaneous interference. This periodic transmission strategy maintains resource efficiency while eliminating interference through temporal separation.
2Object-affected harmful factors
If time offset is introduced between adjacent cell SSB transmissions, then SSB-to-SSB interference is reduced improving SINR, but transmission time is increased
Solution Approach 1:
The patent applies local quality by introducing time offsets only for adjacent cells that cause interference, while other cells maintain their original transmission schedule. Each cell's time offset is configured locally based on its specific interference conditions, allowing interference reduction without unnecessarily extending transmission time across the entire network.
Solution Approach 2:
The patent changes the transmission time parameter selectively for affected cells by introducing configurable time offsets. This parameter change is applied only where necessary to eliminate interference, rather than uniformly across all cells. The time offset parameter can be configured to minimize the impact on overall transmission efficiency while still preventing harmful interference.
Data Source
AI summary
Disclosed is a method of transmitting Synchronization Signal Blocks (SSBs) in a Fifth-Generation (5G) New Radio (NR) cellular telecommunication Radio Access Network (RAN). The method is performed by a Radio Unit (RU) device and includes: transmitting first symbols from a first antenna in a first sector, two or more of the first symbols including a first SSB; transmitting second symbols from a second antenna in a second sector, two or more of the second symbols including a second SSB; and transmitting third symbols from a third antenna in a third sector, two or more of the third symbols including a third SSB. The transmitting is performed during a first time slot and a second time slot. The symbols including the first SSB, the symbols including the second SSB, and the symbols including the third SSB are transmitted during different time periods.