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? Millisecond roaming switching,Create a high speed mobile internet experience for rail transit

Millisecond roaming switching
Create a high speed mobile internet experience for rail transit

Full coverage of the train, high access, no interference, support for layer2/layer3 seamless roaming, experience the speed of the Internet as high-speed trains.


Four Problems to be Solved in vehicle Deployment

Four Problems to be Solved in vehicle Deployment
  • The traditional method is unable to provide fixed broadband access, trains can only achieve local area network coverage

  • The train with high speed in operation cannot solve the problem of high-speed handover during roaming

  • Signal radiation and frequency band interference between adjacent cars and neighboring APs do not interfere with each other and does not affect normal train communication

  • High crowd density on trains and mostly heavily concurrent users require high access to equipment


Train wireless connection,you can surf the internet without fixed network
Train wireless connection
you can surf the internet without fixed network

A ceiling AP is deployed in the train to cover the train environment, and data is transmitted to the front and rear AP through the compartment controller;

 

Outdoor APs are deployed next to the track of the train, and APs at the rear end of the train are bridged by WDS technology and APs with the same BSSID at the track side.

Millisecond switching,  Zero Packet Loss/Intentional Roaming at 100km/h

Millisecond switching
Zero Packet Loss/Intentional Roaming at 100km/h

The front and rear APs automatically discover adjacent APs on the same frequency track and automatically select an optimal path to establish the main link communication;

 

In the process of roaming, the vehicle-mounted AP and the trackside AP are directly activated, eliminating steps such as request, association, and authentication to improve switching efficiency;

 

Trackside APs are automatically numbered, and roaming paths can be automatically determined based on the mode of travel during travel to further enhance roaming speed;

 

At the same time, the AP on the rear of the vehicle starts the main and auxiliary frequency bands, and switches automatically according to the signal strength during the driving process to improve the roaming reliability.

Plan the frequency reasonably/channel signal without interference

 

The car AP adopts the directional coverage method and adopts the 5G band. It does not interfere with the CBTC and PIS signals of the train and does not affect the train communication;

 

APs on the same side of the track are deployed on different channels in the same frequency band. The frequencies of APs on different sides of the track are different from each other. No interference occurs during train rendezvous;

 

Automatically binds the SSID (hidden) of the AP connection to ensure that the vehicle's ground communications are connected in a regular manner to prevent mis-connection with other trackside APs when the car is connected.

Plan the frequency reasonably/channel signal without interference

no wait/no off-line, Experience high speed train like surfing speed

no wait/no off-line, Experience high speed train like surfing speed

 

The car AP adopts ceiling-mounted installation to meet the high-concurrent Internet access of multiple users, and a single AP meets 60-100 user access at the same time;

High-quality, high-quality radio frequency chips are used to effectively avoid and deal with bit errors caused by frequency shift and reduce the Doppler effect;

Using the main and backup link mechanisms, the link is automatically switched during train travel to prevent signal interruption caused by AP failures along the track;

According to the priority of access to resources, it dynamically adjusts access control policies for different operating periods and different user objects to ensure access experience.

Related Scheme
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