Method in a communication network and a communication device

Details Method in a communication network and a communication device Method in a communication network and a communication device

1999-03-02

2003-12-09

Vo, Nguyen T. (Department: 2681)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S389000, C370S409000

Reexamination Certificate

active

06661784

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a method for setting up a data transmission connection as set forth in the preamble of claim
1
. The invention relates also to a communication device as set forth in the preamble of claim
10
.
Local area networks usually consist of one or more server computers as well as work stations and other peripheral devices communicating with the same, such as printers and telecopiers. Communication in a local area network is usually implemented in a wired manner, e.g. by Ethernet cabling. Also wireless local area networks are known, where data transmission is implemented by means of radio modems, thereby reducing limitations relating to the placement of cabling, number of connection points and their positioning in a wired local area network.
In local area networks, each peripheral device coupled to the local area network has an address identifying the peripheral device, i.e. client, whereby data is directed to this peripheral device. On the other hand, information from the peripheral device is recognised by the server on the basis of the address of the peripheral device. The peripheral device and the server are equipped with a network adapter determined on the basis of the physical structure of the local area network used at the time, comprising means for receiving messages from the local area network and for transmitting messages to the local area network.
Communication between different communication devices in local area networks usually takes place as data transmission based on messages. A message consists of address data and the actual information to be transmitted. The address data is used for directing messages to the correct device and, on the other hand, for identifying the device that transmitted the message.
Wireless local area networks differ from wired ones primarily in that the data transmission takes place by using a wireless communication method, e.g. by means of radio waves, infrared or inductive data transmission. In the operation, wireless local area networks are typically star networks, i.e. information is transmitted between a server device and a peripheral device. Thus, the information to be transmitted between peripheral devices is conducted from the transmitting peripheral device to the server device which transmits the information further to the receiving peripheral device.
In view of the operation of the local area network, the server device must know which peripheral devices are coupled to it at each time and what is the operating status of these peripheral devices. This can be implemented by using, for example, the above-mentioned communication based on messages, whereby in connection with turning on and a possible change of state, the peripheral device transmits a message to the server device. The server device receives the message and examines the information content of the message.
A local area network is suitable for use e.g. in offices, whereby data is transmitted by using a compact data processor with a sufficient storage capacity. An example of such a portable device is the Nokia 9000 Communicator which can be used both as a mobile station and as a data processor.
When using a wired communication network, also a portable data processor can be connected with a local area network by means of a network interface card, known as such and comprising means for setting up a data transmission connection between the local area network and the portable device. To portable data processors, it is possible to connect different peripheral devices directly without the need of a local area network. The connection can also be based on wireless techniques, usually the infrared technique (IR). By coupling such a peripheral device to a portable data processor or the like, the data of the peripheral device in question in the data processor must be configured before the peripheral device can be used.
Data transmission between different communication devices, such as servers and the clients of servers, in so-called piconets often takes place by means of short distance infrared (IR) data transmission, low power radio frequency (LPRF) data transmission, short distance radio frequency (SDRF) or inductive data transmission, whereby the data transmission distances within the local area network consisting of a single piconet are typically only a few metres or dozens of metres.
In addition to local area networks, wide wireless communication networks are known, such as the public land mobile network (PLMN) which is a communication network based on a cellular system. As an example, one could mention the GSM-900 mobile communication network based on the GSM system (Global System for Mobile Communication). The cells of the communication network are distributed in a wide geographical area, and mobile stations (MS), such as mobile phones, which communicate with the communication network by means of base stations (BS), move from one cell to another. These mobile stations are separated from each other by means of a subscriber-specific identification code, whereby data transmission between two mobile stations, such as data transfer or an audio call, is possible. The identification code used is e.g. the IMSI code (International Mobile Subscriber Number). The communication network takes care of routing information between base stations and mobile services switching centres (MSC) by utilising registration data on the location of the mobile station in the area of the cells of different base stations. Wireless communication networks include also GSM-1800, GSM-1900, PDC, CDMA, US-TDMA, IS-95, USDC (IS-
136)
, iDEN (ESMR), DataTAC, and Mobitex.
For completing data transmission and processes related to data transmission by data processors connected in a local area network, such as servers and clients, for example peripheral devices and possibly also wireless communication devices, there must be a collection of communication rules available, determining the allowed messages and the operation of the communicating parties at different stages of the communication.
One such collection of communication rules is, in a known manner, a protocol, i.e. a practice whereby devices communicate with each other. For data transmission particularly in wireless communication networks, a wireless application protocol (WAP) has been developed, and this will be used as an example in the following description. In a known manner, one version of the WAP application protocol is described e.g. in the publication WAP Architecture Draft Version 0.9 (1997-09) published in the Internet network, describing e.g. the architecture of the WAP application protocol. By means of the WAP application protocol, it is possible to define a series of protocols at different levels, whereby it is possible to develop new services and devices for present and future wireless communication networks, e.g. mobile communication networks based on a digital cellular network. The WAP application protocol has been already developed e.g. for the short messaging service (SMS), unstructured supplementary service data (USSD), circuit switched data (CSD) and global packet radio system (GPRS) services of the GSM network.
SUMMARY OF THE INVENTION
It is an aim of the present invention to achieve a system that, by means of a local area network, makes connections to data processors, such as servers, clients of the servers, or them both, possible for conducting data transmission. The purpose of the invention is particularly to define a system for communication between a WAP server and a WAP client complying with the WAP application protocol in the area of a piconet utilising IR or SPRF services and utilising this piconet. The method of the invention is characterised in what will be presented in the preamble of the appended claim
1
. The communication device of the invention is characterised in what will be presented in the preamble of the appended claim
10
.
The application layer of the architecture of the above-mentioned WAP application protocol applies a defined wireless application environment (WAE)

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