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Key Features

  • Client based roaming schemes
  • Seamless Fast Roaming by Dual WLAN interfaces
  • Compliant with IEEE 802.11r
  • Applicable for IEEE 802.11p
  • Bump-less redundancy by IEC 62439-3

Typical Applications

  • VoIP for mobile clients
  • Broadband CCTV or remote control
  • CBCT Systems
  • Wireless Access in Vehicular Environments (WAVE)

Client Based Fast Roaming

Interruption-less IEEE 802.11r WLAN Connection for Industrial Mobile Clients

IEEE 802.11r Fast Roaming with Dual WLAN Scheme

The client based Fast Roaming algorithm software enables integrators to realize mobile M2M applications such as VoIP, CCTV, CBCT or Remote Control on a WLAN based network infrastructure.

  • Description
  • Specification
  • Features
  • Downloads

Description

The challenge of minimal connection interruption during cell handovers is solved by a dual WLAN Fast Roaming solution that ensures a seamless connection from mobile clients to the stationary access points.

Reason to use private WLAN networks and not the public mobile networks

The standard WLAN technology (IEEE 802.11a/b/g/n) can be used to establish wide area private networks where the public mobile network (3G, 4G) or proprietary radio technologies cannot fulfill the application requirements:

  • Avoidance of proprietary equipment and full control over the network infrastructure
  • High availability and quality of service by network redundancy
  • Privacy and security aspects
  • Data intensive communication at reasonable costs
  • Network coverage for difficult infrastructure (underground, tunnels)

The availability of standard WLAN equipment together with seamless roaming capability finally allows the customer choosing this cost effective solutions.

NetModule offers middleware components to be integrated on NetModule Wireless Routers or on customer specific WLAN devices.  

Specification

Dual IEEE 802.11r Fast Roaming The middleware component requires IEEE 802.11r fast roaming support with dual WLAN interfaces client hardware.
Client Based ControlThe roaming is actively controlled by an algorithm on the client and does not need a central WLAN controller as other Fast Roaming solutions.
NetModule's client middleware yields massive WLAN roaming times improvements on existing stationary WLAN infrastructure.
Key ManagementFast Transition Pre-Shared Keys (PSK) for roaming time < 30ms (no packet loss)
Alternating Connection SchemeThe dual WLAN interfaces are controlled on an alternating AP connection scheme that allows seamless fast roaming with zero interruption for IEEE 802.11r enabled access points and clients.
Fixed Connection SchemeThe client device setup with a dedicated data connection interface in combination with a scanning-only interface supports maximum fast roaming performance with IEEE 802.11r enabled or standard WLAN infrastructure.
It can be enhanced with IEEE 62439-3 PRP for redundant systems.
WLAN RedundancyHigh availability applications can be realized by fully redundant WLAN infrastructure in combination with the IEC 62439-3 PRP middleware component. The system ensures 0ms recovery time for fail over.
Supported Operating SystemsThe middleware component is available for Linux, other operating system can be supported on request.
Recommended Client HardwareNetModule Wireless Routers: NB3700-2W for dual WLAN interface system variant, NB3700-W, NB2700-W or NB1600-W
Recommended AP HardwareNetModule Wireless Routers: NB1600-W, NB2700-W or NB3700-W

Features

Client Based Fast Roaming with Fixed Connection Scheme

The client device setup with a dedicated data connection interface in combination with a scanning-only interface supports maximum fast roaming performance with IEEE 802.11r enabled or standard WLAN infrastructure. It can be enhanced with IEEE 62439-3 PRP for redundant systems.

IEEE 802.11r with fixed connection scheme - Situation 1

1: Established connection on interface 1 (red) with concurrent scanning on interface 2 (blue). 

The client based control algorithm has detected the increasing signal strength of the next stationary AP.

IEEE 802.11r with fixed connection scheme - Situation 2

2: Interface 1 (red) is connected with maximum data rate and signal strenght.

The dedicated scanning interface 2 (blue) is searching for surrounding stationary APs.

IEEE 802.11r with fixed connection scheme - Situation 3

3: Interface 1 (red) is in the roaming process to change to next stationary AP. The command for the hand-over has been initiated by the client control algorithm.

Due to IEEE 802.11r and optimized driver software, the traffice interruption is less than 30ms.

Client Based Fast Roaming with Alternating Connection Scheme

The dual WLAN interfaces are controlled on an alternating AP connection scheme that allows seamless fast roaming with zero interruption for IEEE 802.11r enabled access points and clients.

IEEE 802.11r with alternating connection scheme - Situation 1

1: Both interfaces are connected to stationary APs which allows a maximum data bandwidth.

The client based control algorithm monitors a decreasing signal strength on interface 1 (red).

IEEE 802.11r with alternating connection scheme - Situation 2

2: Only interface 2 (blue) is connected and all traffic is led via a single interface.

Interface 1 (red) is scanning for the next stationary AP. The client control algorithm will never associate two interfaces to the same AP but follow the alternating connection scheme.

IEEE 802.11r with alternating connection scheme - Situation 3

3: Interface 1 (red) is again connected and the stationary AP of interface 2 (blue) is still in range.

Both connections can be used for communication and the data rate is again on its maximum.



Please contact:

Benjamin Amsler Please contact: Netmodule

Benjamin Amsler

+41 31 985 25 10

Send E-Mail to Benjamin Amsler