Downlink Synchronization via Reference Cell Beamforming
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Solution Overview
Problem
Current cellular communication systems face challenges in implementing downlink synchronization using beamforming technology, particularly with millimeter-wave high frequency bands due to severe attenuation and complex beam training processes, which result in inefficient channel resource usage and low system efficiency.
Innovation Solution
A method for downlink synchronization in cellular communications systems that involves a base station sending downlink synchronization reference information to UE using dedicated signaling or system messages, and sending a beam including a downlink synchronization channel based on UE location, allowing UE to perform synchronization by referencing the downlink synchronization channel of a first cell, thereby enabling synchronization through beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming technology is used for downlink synchronization in millimeter-wave bands, then path loss is compensated and coverage is extended, but the beam training process becomes complex and system efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-configuring downlink synchronization reference information in the first cell that can be referenced by the second cell. This allows the UE to perform downlink synchronization in the second cell by referencing the first cell's synchronization channel, eliminating the need for complex beam training procedures while maintaining synchronization reliability in millimeter-wave bands.
Solution Approach 2:
The patent makes the downlink synchronization reference information universal by allowing it to be shared across multiple cells (first cell and second cell). The same reference information can be used for synchronization purposes in both cells, reducing the need for cell-specific beam training and simplifying the overall synchronization process while maintaining reliability.
2Area of stationary object
If omni transmission is used for downlink synchronization channel, then coverage is maximized, but channel resources are wasted and system efficiency is low
Solution Approach 1:
The patent applies local quality by transmitting the downlink synchronization channel in the second cell through a directed beam rather than omni-directional transmission. The beam is targeted toward the UE's location, which concentrates the transmission energy in the needed direction, improving system efficiency while still achieving adequate coverage for the target user equipment.
3Measurement precision
If dedicated signaling is used to send downlink synchronization reference information, then synchronization accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies copying by having the second cell reference the downlink synchronization reference information from the first cell rather than transmitting it independently. The UE can copy or reference the synchronization timing and frequency information from the first cell, achieving accurate synchronization while avoiding the signaling overhead of transmitting duplicate reference information in the second cell.
Data Source
AI summary
Embodiments of the present disclosure provide a downlink synchronization method, an apparatus, and a system, and relate to the communications field, so as to reduce downlink synchronization complexity and improve downlink synchronization efficiency. According to the downlink synchronization method, abase station sends downlink synchronization reference information to UE by using dedicated signaling or a system message, where the downlink synchronization reference information is used to instruct the UE to perform downlink synchronization in a second cell by referring to a downlink synchronization channel of a first cell; and the base station sends, in the second cell according to location information of the UE, a beam including a downlink synchronization channel to the UE, where the first cell and the second cell include an overlapped coverage area. The embodiments of the present disclosure are applied to synchronization channel sending.