Coordinated Synchronization Signal Transmission for Inter-Cell Interference Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Simultaneous transmissions of synchronization signals from neighboring base stations in wireless communication systems cause inter-cell interference, affecting synchronization performance and measurement accuracy for user equipment devices.
Innovation Solution
Base stations coordinate with each other to determine interference profiles and schedule synchronization signal transmissions, requesting user equipment to perform measurements based on these profiles, thereby minimizing interference and improving synchronization channel quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base stations simultaneously broadcast synchronization signals at deterministic time periods, then network synchronization coverage is improved, but inter-cell interference increases and measurement accuracy deteriorates
Solution Approach 1:
The patent implements periodic SS burst sets transmitted at configured intervals, where each SS burst set contains multiple SS bursts. The periodic transmission pattern allows UEs to receive synchronization signals at regular intervals while enabling network coordination to manage interference between neighboring cells through synchronized timing relationships.
Solution Approach 2:
The network configures UEs with advance knowledge of SS burst set periodicity and timing relationships before measurements are performed. This preliminary configuration enables UEs to know when to expect synchronization signals from serving and neighboring cells, allowing them to perform measurements during interference-free periods and improving measurement accuracy.
2Area of stationary object
If base stations simultaneously transmit synchronization signals, then synchronization coverage is enhanced, but inter-cell interference increases affecting measurement accuracy
Solution Approach 1:
By organizing synchronization signals into periodic SS burst sets with configured intervals, the system achieves wide coverage through repeated transmissions while creating predictable interference patterns that can be managed through network coordination and UE measurement configuration.
Solution Approach 2:
The network provides UEs with preliminary configuration information about SS burst set periodicity and timing, enabling UEs to anticipate signal arrivals from multiple cells and perform measurements during optimal time windows when interference is minimized, thus maintaining coverage while reducing harmful interference effects.
3Measurement precision
If synchronization signals are transmitted frequently, then synchronization accuracy is improved, but interference between neighboring cells increases
Solution Approach 1:
The system uses periodic SS burst sets with configurable intervals to provide sufficient measurement opportunities for accurate synchronization while avoiding excessive transmission frequency. The periodic structure ensures that UEs receive enough signals for accurate measurements without causing continuous interference between neighboring cells.
Solution Approach 2:
By pre-configuring UEs with knowledge of SS burst timing and periodicity, the system enables UEs to perform measurements at optimally timed intervals. This preliminary configuration ensures measurement accuracy is achieved through properly spaced transmissions rather than frequent simultaneous transmissions that would increase interference.
Data Source
AI summary
Wireless communications systems and methods related to synchronization signal (SS) transmission coordination among base stations (BSs) and restricted SS measurements at user equipments (UEs) are provided. A first BS transmits a first SS burst in a first SS transmission period of a plurality of SS transmission periods. The first SS transmission period is designated to the first BS. A second SS transmission period of the plurality of SS transmission periods is designated to a second BS. The first SS transmission period and the second SS transmission period are different. The first BS receives, from a UE, a first signal in synchronization with the first SS burst. The first signal includes a SS measurement of the first SS burst.