Downlink Synchronization Signals Using Random Propagation Channels
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Solution Overview
Problem
Existing wireless link synchronization techniques require high receive power levels and complex logic, limiting their effectiveness in achieving accurate synchronization between stations and devices.
Innovation Solution
A base station with an antenna array transmits a sequence of downlink synchronization signals using a plurality of propagation channels selected according to a partly random pattern, enhancing coverage and reducing fading by providing diversity and averaging signal noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference implementations of synchronization signals are used, then synchronization can be achieved, but significant receive power levels are required
Solution Approach 1:
The base station segments the transmission of synchronization signals across multiple propagation channels instead of using a single channel. This segmentation allows the signal energy to be distributed and received more effectively, reducing the required receive power level while maintaining synchronization accuracy.
Solution Approach 2:
The patent introduces an additional dimension by transmitting synchronization signals through multiple propagation channels (spatial dimension) rather than relying solely on power increase. This multi-channel approach provides diversity gain and improves signal reception without requiring significantly higher power levels.
2Reliability
If reference implementations of synchronization signals are used, then synchronization can be achieved, but complex logic is required at stations and devices
Solution Approach 1:
The system enables devices to automatically acquire timing and frequency information from the downlink synchronization signals without requiring complex processing logic. The base station handles the complexity of multi-channel transmission, while devices simply need to detect and process the transmitted signals to achieve synchronization.
3Reliability
If multiple propagation channels are used for transmitting synchronization signals, then fading impact is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent changes the transmission parameter by using an at least partly random pattern for selecting propagation channels. This randomization simplifies resource allocation by eliminating the need for complex scheduling and coordination, while still providing diversity gain to reduce fading impact on synchronization signals.
Data Source
AI summary
A sequence of downlink synchronization signals is transmitted to a device using a plurality of propagation channels. The plurality of propagation channels is selected according to an at least partly random pattern.