Network Device Signal Transmission for High-Frequency Access
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Solution Overview
Problem
In high-frequency wireless communication scenarios, massive MIMO antennas create narrow beams that often fail to cover all users in a cell, leading to difficulties in transmitting synchronization, broadcast, and common channel information, which hampers user access.
Innovation Solution
A network device sends a first signal before cell selection to allow the base station to learn its location and adjust the beam, followed by a second signal using different resources for access, ensuring successful cell selection and access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If massive MIMO antennas are used to achieve high antenna gain, then path loss is compensated, but the beam becomes narrow and cannot cover all users in a cell
Solution Approach 1:
The patent segments the cell coverage area into multiple sectors, each served by a separate transmission point with its own beamforming capabilities. This allows each transmission point to concentrate energy in a specific direction while collectively covering the entire cell, resolving the contradiction between high gain and wide coverage.
Solution Approach 2:
The patent introduces spatial dimensionality by deploying multiple transmission points at different locations. Instead of relying on a single omnidirectional beam, the system uses multiple directional beams from different spatial positions to achieve both high gain and comprehensive coverage through spatial diversity.
2Power
If narrow beams are used to achieve high antenna gain, then path loss is compensated, but synchronization and broadcast channel information cannot be sent to all users simultaneously
Solution Approach 1:
The patent segments the information transmission task across multiple transmission points. Each transmission point sends synchronization and broadcast channel information to users within its coverage sector, ensuring that all users in the cell can receive necessary information through their respective nearest transmission points.
Solution Approach 2:
The patent introduces beamforming as an intermediary mechanism that adapts the narrow high-gain beams to cover specific user groups. By dynamically adjusting beam directions and using multiple transmission points as intermediaries, the system ensures that critical information reaches all users despite the narrow beamwidth of individual antennas.
3Power
If beamforming is used to increase antenna gain, then signal strength is improved, but cell selection success rate decreases due to narrow beam coverage
Solution Approach 1:
The patent segments the cell into multiple coverage zones with dedicated transmission points. During cell selection, users can successfully connect to the transmission point providing the strongest signal in their location, rather than relying on a single omnidirectional beam. This segmentation ensures both high signal strength and reliable cell selection.
Solution Approach 2:
The patent dynamically changes beamforming parameters (direction, width, power) based on user location and channel conditions. During cell selection, the system adjusts beams to ensure adequate coverage for initial access, then optimizes for high gain during data transmission, thereby maintaining both reliability and signal strength.
Data Source
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AI summary
Embodiments of the present invention provide a signal transmission method and a network device. The signal transmission method includes: sending, by a first network device, a first signal before performing cell selection; and sending, by the first network device, a second signal after performing cell selection, where resources used by the first network device to send the first signal and the second signal are different, and the second signal is a random access signal. According to the signal transmission method and the network device provided in the embodiments of the present invention, an access success rate of a network device is increased.