Downlink Signal Positioning for Faster Beam Sweeping
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face limitations in beam sweeping speed due to the inability to distinguish symbol sequence numbers and subframe numbers when sending multiple synchronization signals, leading to inefficient use of high-frequency bands and restricted communication capacity.
Innovation Solution
A method for indicating position information of signals in the time domain based on their relative positions in the frequency or time domain, allowing for the determination of symbol sequence numbers, subframe numbers, and beam information, thereby enabling faster beam sweeping and improved communication capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple synchronization signals are sent in different beams using analog beamforming, then coverage is improved, but beam sweeping speed deteriorates due to inability to distinguish symbol and subframe numbers
Solution Approach 1:
The patent introduces a new dimension for signal identification by mapping synchronization signals to different physical resource blocks (frequency domain) instead of only using time domain sequencing. This allows receivers to distinguish between multiple synchronization signals sent in different beams simultaneously or in rapid succession, thereby improving beam sweeping speed while maintaining wide coverage.
Solution Approach 2:
The patent introduces physical resource block allocation as an intermediary mechanism to carry beam identification information. By assigning different physical resource blocks to different synchronization signals, the system enables rapid beam sweeping without requiring complex time sequencing, thus resolving the contradiction between coverage and sweeping speed.
2Area of stationary object
If synchronization signals are sent in a sweeping mode across multiple beams, then coverage is improved, but the quantity of times of sending increases significantly
Solution Approach 1:
The patent combines multiple synchronization signal transmissions into a single physical resource block structure, where each synchronization signal carries both its data and beam identification information. This merging approach reduces the total number of separate sending operations while maintaining comprehensive coverage across multiple beams.
Solution Approach 2:
The patent makes the physical resource block allocation system multi-functional by using it simultaneously for resource allocation and beam identification. This universal approach allows the same mechanism to serve multiple purposes, reducing the overall complexity and number of operations required for multi-beam synchronization signal transmission.
3Reliability
If PSS and SSS are sent in time division manner occupying at least two symbols, then synchronization is achieved, but beam sweeping speed is limited
Solution Approach 1:
The patent transitions from time-domain separation of PSS and SSS to frequency-domain separation using different physical resource blocks. This dimensional change allows both synchronization signals to be transmitted more efficiently, maintaining their distinct functions while enabling faster beam sweeping through reduced time occupation.
Data Source
AI summary
The present disclosure includes example downlink signal sending methods, downlink signal receiving methods, and devices. In one example method a transmit end device indicates position information of at least one of a first signal or a second signal in time domain based on a position relationship between the first signal and the second signal in at least one of frequency domain or time domain. The transmit end device can then send a frame including the first signal and the second signal. In embodiments of the present invention, position information of a synchronization signal in time domain can be indicated, and sending of a single-symbol synchronization signal is also supported.