Wireless Handover via Round Trip Time Comparison
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Solution Overview
Problem
Existing wireless communication systems have high latency, which is unsuitable for mission-critical applications like manufacturing, automotive, and medical uses that require low latency and high reliability, as they are designed for voice and internet access with acceptable latency of 50-200 ms, whereas mission-critical applications need latency below 1 ms.
Innovation Solution
A communication device method that measures and compares round trip times between a serving cell and a target cell to determine the optimal handover, selecting the cell with the shorter round trip time to reduce latency for critical message communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing wireless communication systems are used for mission-critical applications, then voice and internet access functionality is maintained, but latency is too high (50-200 ms) for mission-critical requirements
Solution Approach 1:
The patent changes the handover decision parameter from traditional signal strength metrics to round trip time (RTT) measurements. By measuring and comparing RTT values between serving and target cells, the system selects the cell with the shortest RTT, directly optimizing latency for mission-critical communications while maintaining reliable connectivity
2Loss of time
If handover is performed based on traditional metrics, then connection stability is maintained, but latency cannot be optimized for time-critical communications
Solution Approach 1:
The patent implements a feedback mechanism where the communication device continuously measures round trip time to the server via the serving node and target node, then uses this measured feedback information to make informed handover decisions. The device compares RTT values and triggers handover when a target cell demonstrates shorter latency, creating a closed-loop system that actively optimizes communication timing
Data Source
AI summary
A communication device and method therein for handover from a serving cell to a target cell in a communication network are disclosed. The communication device is configured to obtain a first round trip time between the communication device via the network node and a server and obtain a second round trip time between the communication device via a target node in the target cell and the server. The communication device is further configured to send a request for handover from the serving cell to the target cell based on at least the first round trip time and the second round trip time.