Synchronization Signal Beam Sweeping for 5G Initial Access
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Solution Overview
Problem
In wireless communication systems, particularly in large-scale antenna systems like 5G, the initial connection and synchronization between a terminal device and a base station are challenging due to the increased number of antenna ports, which complicates beamforming and synchronization signal transmission, especially in high-frequency bands where path losses are significant.
Innovation Solution
Implement beamforming techniques for synchronization signals, including transmit beamforming by the base station and feedback mechanisms for determining matching transmit and receive beams, allowing for efficient synchronization and reduced overhead in beam scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of antenna ports is increased to form a Massive MIMO system, then beamforming gain and communication capacity are improved, but device complexity and beam management difficulty increase
Solution Approach 1:
The patent segments the beam management process into distinct phases: initial beam sweeping for synchronization signal transmission, followed by beam indication using TCI states for data transmission. This segmentation allows the system to handle the large number of antenna ports by breaking down the complex beam management into manageable steps, reducing overall system complexity while maintaining beamforming gain.
Solution Approach 2:
The patent implements preliminary beam sweeping during the initial access phase where the base station transmits synchronization signals through multiple beams before data transmission begins. This preliminary action establishes beam correspondence between base station and terminal, so that when data transmission starts, the beam configuration is already determined, simplifying subsequent beam management despite having many antenna ports.
2Reliability
If beamforming is applied to synchronization signals, then synchronization performance is improved, but overhead for beam scanning increases
Solution Approach 1:
The patent employs periodic beam sweeping where the base station transmits synchronization signals through different beams in a periodic sequence. Each beam is transmitted for a specific duration, and this periodic pattern allows terminals to efficiently scan through available beams without requiring continuous scanning, thus improving synchronization performance while controlling the time overhead through optimized periodic intervals.
Solution Approach 2:
The patent ensures continuous beam coverage by designing the beam sweeping pattern to maintain uninterrupted synchronization signal transmission across all directional beams. The beam switching between different directions is performed continuously without gaps, ensuring that terminals can always acquire synchronization signals regardless of their position, thereby maintaining high synchronization performance while optimizing the overall scanning time.
3Productivity
If the number of antenna ports is increased, then communication capacity is improved, but path loss compensation becomes more difficult in high-frequency bands
Solution Approach 1:
The patent applies local quality by configuring different beamforming parameters and power levels for different antenna ports and directional beams. Instead of uniform transmission, each beam is optimized with appropriate power compensation tailored to its specific propagation characteristics and path loss conditions, allowing the system to effectively serve multiple terminals in different directions while compensating for frequency-dependent path losses.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting beamforming weights, transmission power, and beam directions based on channel conditions and terminal locations. These parameter adjustments enable the system to adapt to varying path loss conditions in high-frequency bands, maintaining communication capacity by optimizing the transmission parameters for each specific beam and terminal configuration.
Data Source
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AI summary
The present disclosure relates to electronic devices, methods, and storage medium for wireless communication system. Various embodiments are described with respect to beam management. In one embodiment, an electronic device for a base station side in a wireless communication system can comprise a processing circuitry configured to repetitively transmit a synchronization signal (SS) to a terminal device by using different transmit (TX) beams based on a TX beam configuration; the SS can indicate information of the TX beam used to transmit the SS. The processing circuitry can be configured to obtain feedback from the terminal device; the feedback can comprise information of the TX beam for being used in TX beam management.