Radio Base Station Synchronization via User Terminal Feedback
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Solution Overview
Problem
In LTE systems, when downlink signals are transmitted from multiple transmission points, synchronization between these points is challenging, leading to potential issues with time and frequency synchronization, which can decrease the reliability of signal reception.
Innovation Solution
A radio communication system where a first radio base station and a second radio base station, overlapping the area of the first, receive synchronization correction information from a user terminal to establish synchronization between the transmission points, using synchronization signals and a synchronization management server to correct desynchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downlink signals are transmitted from multiple transmission points to improve throughput and coverage, then the system can serve more users and increase data rates, but time synchronization and frequency synchronization between transmission points cannot be established, leading to decreased reception reliability
Solution Approach 1:
The patent implements a feedback mechanism where the user terminal reports synchronization status information to the network side, and the network adjusts transmission parameters accordingly. This allows the system to maintain synchronization accuracy while enabling multi-point transmission, resolving the contradiction between throughput improvement and reception reliability.
Solution Approach 2:
The patent changes the synchronization parameter from absolute time synchronization to relative time synchronization based on user terminal position. By adjusting the synchronization parameter dynamically according to the user's location and channel conditions, the system achieves both multi-point transmission capability and reliable reception.
2Productivity
If CoMP transmission is implemented to improve throughput for cell edge users, then data rates increase, but the complexity of synchronization management between multiple cells increases
Solution Approach 1:
The patent extracts the synchronization management function from the user terminal and places it in the network side. The network side apparatus performs synchronization correction based on user terminal position information, reducing the complexity at the terminal while enabling CoMP transmission.
Solution Approach 2:
The patent introduces user terminal position information as an intermediary parameter that mediates between the multiple transmission points and the user terminal. This intermediary allows the network to coordinate synchronization across cells without requiring direct complex synchronization management between all transmission points.
3Ease of manufacture
If fixed time synchronization is used between transmission points, then synchronization is simple to implement, but it cannot adapt to different user terminal positions and channel conditions, leading to synchronization loss
Solution Approach 1:
The patent transforms the synchronization system from static (fixed time synchronization) to dynamic (relative time synchronization based on user position). The synchronization parameters are continuously adjusted according to changing user terminal positions and channel conditions, maintaining adaptability while remaining practical to implement.
Data Source
AI summary
The present invention is designed to establish synchronization between transmission points when downlink signals are transmitted from a plurality of transmission points to a user terminal. A radio communication system has a first radio base station that forms a first cell, a second radio base station that forms a second cell, which is placed on the area of the first cell in an overlapping manner, and a user terminal that is capable of carrying out radio communication with the first radio base station and the second radio base station, and the second radio base station has a receiving section that receives synchronization correction information, which is for establishing synchronization with a synchronization target, from the user terminal, and a synchronization correction section that corrects synchronization based on the synchronization correction information.