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Solution


Rilheva Remote Mangement

What's M2M

Xeo4 operates in the M2M (Machine to Machine) market offering/supplying advanced cloud-based remote control services. M2M field is constantly evolving and still offers significant growth opportunities. M2M fixes all those applications where devices communicate with each other automating processes and even complex systems.

It's the upgrade of traditional remote control, an advanced remote management where each device is interconnected to another and data are continuously exchanged, revolutionizing classic concepts of "data call".


M2M market offers great potential opportunities for new services and products that hide significant technologic complexities.

To challenge this situation it's necessary to be at the forefront always and constantly. It's therefore fundamental to partner with companies competent and specialized in advanced IP-based cloud remote management.

Xeo4 will be able to accompany you in this trip by showing only the benefits of these new technologies.

GPRS definition-benefits-critical

GPRS (General Packet Radio Service) is an IP-based communication technology that uses packet data transfer.
The main difference, compared to GSM net, is given by communication costs : in GPRS net it depends on quantity of data transmitted and received, while in the commutate net it depends on connection time.


This generates a high advantage when terminal needs a permanent connection and limited data traffic (just what happens in remote plant management).

Another advantage of GPRS – compared to GSM commutated net – is given by warranty of data service, still in case of limitations on available band. In practical terms, this allows to communicate even in case of high traffic on telephone net. Furthermore, most operators guarantee GPRS service wherever there's GSM coverage. For these reasons, GPRS cellular net represents the perfect solution for traditional remote control systems featured by high number of plants, distributed over a spread area, and limited data content to transmit.


However, due to low world IP address availability, telephone operators frequently apply NAT (Network Address Translation) policies and/or restrictions (firewalling) on their own IP net. This makes it very difficult to identify each remote device connected to the common internet via GPRS.

GPRS – Private or Public IP

GPRS standard does not allow to establish communication point-to-point (on the contrary of GSM data mode). It's therefore necessary that connection starts from remote device towards operator net (APN). This fundamental constraint implies that device must be supplied with intelligence on board (it cannot be an ordinary modem).
According to telephone operator used, a public or private IP will be assigned to the modem. Address is however always dynamic. (unless you use an owner APN with static IP - expensive and binding solution).



In case of public IP, GPRS modem can access Internet services and control center can communicate bi-directionally provided to know IP address temporarily assigned to remote station and if provider does not apply input firewalling rules.

In case of private IP, operator applies a NAT rule. In this case, remote control center won't be able in any way to contact remote device from outside. This procedure is widespread among telephone operators due to the lack of IPv4 addresses (public IP assigning implies owning as many IP addresses as GPRS/UMTS active connections of all operator customers). A possible solution consists in using a router that establishes a VPN (Virtual Private Network) with remote control center.
This solution – technically valid –does not guarantee any optimization criteria for data traffic (GPRS costs depend on volume) as it's transparent to the protocol that remote control center (SCADA) adopts.



Xeo4 developed, therefore, Rilheva solution that is based on the use of an intelligent GPRS device that allows to :


GPRS: connection between two devices

retegprs


GPRS net does not allow connections point-to-point between mobile devices.
For this reason Rilheva technology is based on a "star center", the core of the system that routes communications among remote devices.



NAT

NAT (network address translation) technique modifies IP addresses of packets in transit on a system that acts as a router.
Traditionally NAT has established itself as a remedy to lack and costs of available public IP. The techniques used to economize public IP addresses make devices not directly reachable from Internet, therefore this solution is often adopted for security reasons.



A possible solution to the lack of IP addresses is IPv6, but this technology won't be available for many years.


retegprs

For GPRS net remote control applications, Rilheva solution is immune to Nat managed IP addresses problems and it's independent from IP type (dynamic public or private).




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