Intra-Frequency Handover Reception for Near-Zero Downlink Interruption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Downlink signal transmission is interrupted during the handover process of a terminal from a source cell to a target cell, particularly in scenarios requiring zero or nearly zero service interruption, such as mobile office and mobile video services.
Innovation Solution
A method and apparatus that enable a terminal to receive downlink signals from both the source and target base stations on the same carrier frequency during handover by configuring multiple processing resources and adjusting automatic gain control (AGC) settings, allowing seamless signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal switches from source base station to target base station during handover, then the terminal can maintain connection with the network, but downlink signal transmission is interrupted
Solution Approach 1:
The terminal performs preliminary actions by receiving and processing the first message from the source base station before the handover is complete. This message contains configuration information for receiving downlink signals from the target base station, allowing the terminal to prepare reception resources in advance and minimize interruption time.
Solution Approach 2:
The patent implements continuity of useful action by enabling the terminal to receive downlink signals from both the source base station and the target base station simultaneously during the handover transition period. This overlapping reception ensures that data transmission continues without interruption while the terminal switches between base stations.
2Loss of time
If the terminal receives downlink signals from both source and target base stations simultaneously, then service interruption is reduced to zero or nearly zero, but processing resource complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the processing resources into separate configurations for receiving signals from the source base station and the target base station. The terminal configures distinct reception parameters, frequency offsets, and processing chains for each base station, allowing independent optimization and management of each signal path.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting reception parameters based on the handover state. The terminal modifies frequency offsets, timing advances, and resource allocation parameters according to whether it is receiving from the source base station, target base station, or both simultaneously, enabling flexible adaptation to different reception scenarios.
Data Source
AI summary
This application provides a downlink signal receiving method, a terminal, and a source base station. The method includes: sending a first capability indication to a source base station, wherein the first capability indication indicates that the terminal has an intra-frequency receiving capability; in response to the first capability indication, receiving a first message from the source base station, wherein the first message comprises a first indication, and the first indication indicates the terminal to receive, during a handover process, a downlink signal from the source base station and a downlink signal from a target base station, wherein the downlink signal from the source base station and the downlink signal from the target base station have a same frequency; and receiving during the handover process, the downlink signal from the source base station and the downlink signal from the target base station based on the first indication.