Beamforming Handover Weights for 5G Propagation Loss
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Solution Overview
Problem
In 5G mobile networks, the handover process faces increased failure rates due to uncompensated propagation loss in the transmission and reception of control signals between terminal apparatuses and target base stations, particularly affecting the receipt of access signals during handovers.
Innovation Solution
Implementing a system where base stations transmit reference signals using beamforming, allowing terminal apparatuses to measure and report preferred beamforming weights, which are then used by target base stations to receive access signals, thereby compensating for propagation loss and enhancing handover success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is used for data transmission after handover, then propagation loss is compensated, but propagation loss is not compensated for control signals during handover leading to increased failure rate
Solution Approach 1:
The source base station performs preliminary actions by determining appropriate beamforming weights before handover and including them in the handover request message sent to the target base station. This allows the target base station to have the access signal received using pre-calculated beamforming weights, compensating for propagation loss before the actual handover occurs.
Solution Approach 2:
The handover request message acts as an intermediary carrier, transporting the beamforming weights from the source base station to the target base station. This intermediary mechanism enables the transfer of critical beamforming information without requiring direct communication between the base stations after handover.
2Measurement precision
If beamforming weights are determined by terminal apparatus, then accurate beamforming can be achieved, but additional signaling overhead is required for weight reporting
Solution Approach 1:
The invention extracts only the essential beamforming weight information from the terminal apparatus's measurements and reports it to the source base station. The source base station then uses this information to determine the final beamforming weights, separating the measurement function from the weight determination function to reduce signaling overhead.
Solution Approach 2:
Instead of having the terminal apparatus directly control beamforming, the source base station creates a copy of the necessary beamforming parameters based on terminal feedback and uses these copied parameters to configure the target base station's receiving beam, reducing the need for continuous terminal involvement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach increases the success rate of handovers by effectively compensating for propagation loss in access signals, ensuring reliable signal reception and reducing handover failure rates.
Implementation Method 1
a first communication processing unit configured to transmit reference signals using beamforming
Implementation Method 2
The second communication processing unit is configured to receive an access signal of the terminal apparatus based on the beam related information
Data Source
AI summary
[Object] To make it possible to further increase a possibility of a success in a handover.[Solution] A first apparatus of the present invention includes: a first communication processing unit configured to transmit reference signals using beamforming; and a second communication processing unit configured to receive a handover message from a source base station of a handover of a terminal apparatus. The handover message includes beam related information related to a beam. The first communication processing unit is configured to receive an access signal of the terminal apparatus based on the beam related information.