Single-Frequency Network Cell Group Beam Transmission
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Solution Overview
Problem
In 5G mobile communications, single-cell multi-beam transmission provides high transmission gain but requires frequent cell reselection by terminals, while single-frequency network (SFN) transmission offers reduced coverage due to lower transmission gain and increased cell reselection frequency.
Innovation Solution
Implementing an information transmission method using a single-frequency network cell group with at least two cells, where downlink information is sent over a first beam supported by multiple cells in a time-division manner, reducing cell reselection frequency and enhancing network coverage by combining signals from multiple beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If single-cell multi-beam transmission is used, then transmission gain is improved, but cell reselection frequency increases
Solution Approach 1:
The patent combines multiple cells into a single-frequency network cell group that transmits the same signal simultaneously through multiple beams. This merging approach allows the terminal to receive signals from multiple cells at once, eliminating the need for frequent cell reselection while maintaining high transmission gain through narrow beam transmission.
Solution Approach 2:
The patent makes multiple cells serve a universal function by having them all transmit the same downlink signal simultaneously through different beams. This multi-functionality allows the terminal to treat all cells in the group uniformly, reducing cell reselection frequency while achieving diverse transmission paths.
2Productivity
If single-frequency network transmission is used, then cell reselection frequency is reduced, but transmission gain decreases
Solution Approach 1:
The patent segments the transmission system into multiple beams within a single-frequency network cell group. Each beam transmits the same signal independently, allowing the terminal to receive multiple signal copies simultaneously. This segmentation enables the system to maintain narrow beam transmission gain while reducing cell reselection frequency through SFN operation.
Solution Approach 2:
The patent adds a spatial dimension to SFN transmission by introducing multiple beams at different angles. Instead of a single omnidirectional transmission, the system uses multiple directional beams, enabling the terminal to receive signals from different spatial directions simultaneously, thus maintaining transmission gain while reducing cell reselection.
3Area of stationary object
If wide beam transmission is used, then coverage is improved, but transmission gain decreases
Solution Approach 1:
The patent merges multiple narrow beam transmissions from different cells into a unified SFN cell group. By combining the signal energy from multiple beams, the system achieves both the coverage advantage of wide beam transmission and the transmission gain advantage of narrow beam transmission. The terminal receives signals from multiple cells simultaneously, effectively expanding coverage while maintaining high transmission gain.
Data Source
AI summary
An information transmission method includes: receiving, by a terminal, downlink information over a first beam of a single-frequency network cell group. The single-frequency network cell group includes at least two cells, the at least two cells include a first cell that supports transmission of at least two beams, and the first beam is one of the beams supported by the first cell.