Multiplex communications – Wide area network – Packet switching
Patent
1992-10-13
1994-09-27
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370 951, 455 531, H04Q 700
Patent
active
053512359
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method for relaying information in an integrated services network, in which network a message switching service is operated between terminal equipment connected to the network.
2. Description of the Related Art
The type of telephone and data networks are currently use and those presently being designed are digital integrated services networks and normally support both audio communication and digital signal processing. Integrated services networks, as understood in the present context, are networks wherein access to both sound (audio) and digital signal communication channels can be established using basic terminal equipment. Different services can thus be provided which take advantage of this division between digital signal and audio communication channels.
Recent land mobile networks, such as the GSM network designed for Europe, operates in the 900 MHz range. The CMS88 mobile phone system is designed for the United. Both these systems have communication modes digital TMDA. Such networks provide high quality speech signal as well for the capability of transfer and intermediate storage of data on data channels of different types and different rates.
In addition to handling subscriber traffic, a mobile phone system needs an efficient data transmission service to handle diversifying forms of service and complex signalling therein. Thus for instance short message service (SMS) for example, is such a service and can be included in the above networks. A short message service center (SC) is a part of this service and provides receiving and transmitting of messages in digital form one the basis of the so-called "store-and-forward" principle, from one mobile phone to another mobile phone. Signal processing is possible simultaneously with another because short messages are transmitted, as in an integrated services network for instance, over the signalling channel of the GSM network and, not a voice channel.
A corresponding message switching service is also possible in a digital ISDN telephone network as defined by the CCITT, which has both voice channels and signal channels.
The purpose of message switching is to improve the accessibility of terminal equipment subscribers. The specifications for short message transmission in the GSM network, such as GSM 03.40 do not bring about an interface between the MSC and the SC, the structure of the SC, or the different forms of the actual use of the short message service. The communication between the MSC and the SC can instead be realized for instance using an X.25-based packet switching network. In connection there a short message is provided having an effective length of 140 bytes (8 bits).
Furthermore, short message services divided into mobile terminated (MT) services, mobile originated (MO) services, and cell broadcast (CB) services. In cell broadcast service, a message is transmitted in the area of one or more cells to all mobile phones in that area.
SUMMARY OF THE INVENTION
The present invention is concerned with the utilization of this new form of service in the best possible way, so that the availability of the users of the integrated services network and their access of information is crucially improved and so that the speech communication between the users of the voice channels is even partly replaceable by sophisticated informatory auxiliary functions.
One embodiment of the invention is based on the fact that people have a fairly large quantity of personal communication information: telephone numbers, postal addresses, physical addresses, telefax, telex and teletex numbers, etc. Typically, a subgroup of this type of contact information, believed to be meaningful, would be is compiled on a person's visit card which card is distributed to others to facilitate communication. As telephone and data transmission traffic moves into extensive digital integrated services networks, it is foreseen that communication through these networks will rapidly increase. Under present techniques there is no versatile
REFERENCES:
patent: 5136585 (1992-08-01), Nizamuddin et al.
patent: 5204861 (1993-04-01), Wiebe
Jung Min
Safourek Benedict V.
Telenokia OY
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