Downlink Synchronization via Connectionless Preamble Transmission
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Solution Overview
Problem
In wireless communication systems, especially in 3GPP LTE, the process of setting up connections for data transmission is time-consuming and inefficient, particularly for large data transfers, leading to delays and increased signaling overhead, especially during handovers between base stations.
Innovation Solution
A connectionless transmission method is proposed, where user equipment (UE) can transmit data without establishing a connection, using a preamble to request synchronization signal resources from a base station, allowing for efficient downlink synchronization even in disconnected states, and updating location information as needed, with the option to configure synchronization signal resources based on moving speed and using temporary identifiers for accurate signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection setup procedure is performed before data transmission, then reliable communication is established, but transmission delay increases and productivity decreases
Solution Approach 1:
The UE performs downlink synchronization measurement and obtains synchronization signal resource location information before the connection setup procedure. This preliminary action allows the UE to be ready for immediate data transmission once the connection is established, reducing the overall transmission delay while maintaining communication reliability
Solution Approach 2:
The UE performs only the essential downlink synchronization measurement without completing the full connection setup procedure when in idle state. This partial action approach allows the UE to maintain basic synchronization capability with minimal overhead, enabling faster transition to data transmission when needed
2Reliability
If connection setup procedure is performed before data transmission, then communication reliability is improved, but signaling overhead increases and time consumption increases
Solution Approach 1:
The UE performs downlink synchronization measurement and acquires synchronization signal resource location information in advance, before the connection setup procedure begins. This preliminary action eliminates the need for time-consuming synchronization measurements during connection setup, reducing the overall time loss
Solution Approach 2:
The synchronization measurement function is extracted from the connection setup procedure and performed independently in advance. This separation allows the connection setup to proceed more quickly while synchronization is already completed, reducing both time consumption and signaling overhead
3Measurement precision
If downlink synchronization is measured in connected state, then synchronization accuracy is maintained, but device complexity and signaling overhead increase
Solution Approach 1:
The UE autonomously performs downlink synchronization measurement using pre-configured synchronization signal resource location information obtained from system information or previous measurements. This self-service approach eliminates the need for network-controlled synchronization procedures, reducing device complexity and signaling overhead while maintaining synchronization accuracy
Solution Approach 2:
Synchronization signal resource location information is obtained in advance through system information or previous measurements, allowing the UE to perform accurate synchronization measurements independently without requiring complex real-time network coordination
Data Source
AI summary
Provided are a method and an apparatus for obtaining a downlink synchronization in a wireless communication system. A proposed wireless communication system has an environment in which a resource position of a downlink synchronization signal is changed as multi-numerology is applied thereto. Specifically, a terminal transmits a preamble for requesting a synchronization signal transmission resource to a base station. The terminal receives a response signal to the preamble from the base station. Here, the terminal does not have linkage to the base station, and is downlink synchronized with the base station. The response signal includes position information of a synchronization signal transmission resource of a neighboring base station.