Error correction protocol of the network between a radio data terminal modem and a remote data modem using negotiated compression parameters

• US 5,809,066 A
• Filed: 04/15/1994
• Issued: 09/15/1998
• Est. Priority Date: 08/17/1992
• Status: Expired due to Fees

• Current Assignee: Nokia Solutions and Networks US LLC (Nokia Corporation)
• Original Assignee: Nokia Telecommunications Oy (Nokia Corporation)
• Inventors: Terho, Mikko, Suomi, Arto
• Primary Examiner(s): Pham, Chi H.
• Assistant Examiner(s): LUTHER, WILLIAM A
• Application Number:
  US08/211,762
• Time in Patent Office: 1,614 Days
• Field of Search: 375/349, 375/220, 375/221, 375/222, 375/219, 375/249, 375/250, 375/356, 375/240, 371/35, 371/2.1, 333/14, 379/58, 379/59.62, 379/93, 379/97, 379/98, 379/100, 379/61, 379/63, 455/33.1, 455/34.1, 455/34.2, 455/33.2, 455/63, 455/31.1, 455/72, 455/422, 455/426, 455/466, 455/423, 455/557, 370/109, 370/521, 395/612, 395/114, 395/2.91, 395/2.94, 395/888, 358/426, 358/430, 325/240
• US Class Current: 375/222
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365

Abstract

An arrangement for enhancing data transmission in a digital cellular radio network, including a radio data terminal (A), a network terminating unit (IWF) connected to a mobile exchange (MSC) and including a data modem (MOD1), and a remote data modem (MOD2). The radio data terminal (A) and the remote data modem (MOD2) include features for providing data compression and decompression. The digital transmission connection between the radio data terminal (A) and the data modem (MOD1) is a non-transparent asynchronous data connection of a cellular radio system, over which compressed data is transmitted using the error correction of the cellular system. The error correction protocol of the remote modem is used for the transmission of compressed data over the modem connection between the data modem (MOD1) and the remote data modem (MOD2). At the beginning of a data session the data modem transmits compression parameters to the radio data terminal; these parameters are determined on the basis of a handshaking procedure between the data modem and the remote data modem.

Claims

1. A communication system including a digital cellular radio network, comprising:

a radio data terminal;

a network terminating unit connected to a mobile exchange and comprising a data modem equipped for using an error correction protocol;

a remote data modem equipped for using an error correction protocol; and

call control means for establishing a digital transmission connection between the radio data terminal and the data modem and a modem connection between the data modem and the remote data modem;

the radio data terminal and the remote data modem including respective means for transmitting data in a compressed form as compressed data;

the digital transmission connection between the radio data terminal and the data modem being a non-transparent asynchronous data connection of a cellular radio system having an error correction protocol, over which connection said compressed data is transmitted using said error correction protocol of said cellular radio system; and

the data modem of the network terminating unit including means for transmitting compressed data over said modem connection by using the error correction protocol of the remote data modem, and means for transmitting compression parameters to the radio data terminal at the beginning of a data session, said parameters being determined on the basis of a handshaking procedure between the data modem and the remote data modem.

2. The communication system of claim 1, wherein:

the radio data terminal comprises radio terminal equipment having an asynchronous data interface to which data terminal equipment is connected.

3. The communication system of claim 2, wherein:

compressing and decompressing means are disposed in said data terminal equipment for compressing and decompressing said data.

4. The communication system of claim 1, wherein:

said means for transmitting data in a compressed form and said means for transmitting compressed data are constituted by respective means for transmitting data compressed in compliance with CCITT Recommendation V.42bis.

5. The communication system of claim 1, wherein:

said error correction protocol of said data modem is in compliance with CCITT Recommendation V.42.

6. The communication system of claim 2, wherein:

said radio terminal equipment is a mobile phone and said data terminal equipment is a computer.

7. The communication system of claim 3, wherein:

said data compressing and decompressing means are arranged to compress and decompress said data in compliance with CCITT Recommendation V.42bis.

8. The communication system of claim 2, wherein:

said error correction protocol of said data modem is in compliance with CCITT Recommendation V.42.

9. The communication system of claim 3, wherein:

said error correction protocol of said data modem is in compliance with CCITT Recommendation V.42.

10. A method for data transmission in a data session in a communication system including a digital cellular radio network, comprising steps of:

establishing a digital data transmission connection between a calling radio data terminal and a data modem in a network terminating unit connected to a mobile exchange;

transmitting a command including telephone number of a called remote data modem from said calling radio data terminal to said data modem in said network terminating unit;

responding to said command in said data modem by establishing a modem connection between said data modem and said remote data modem;

determining compression parameters for said data session by a handshaking procedure between said data modem and said remote data modem;

transmitting said compression parameters from said data modem to said calling radio data terminal;

transmitting data in a compressed form over said digital data transmission connection using an error correction protocol of the cellular radio network; and

transmitting data in said compressed form over said modem connection using as error correction protocols in both said data modem and said remote modem said error correction protocol of said remote modem.

11. A method for data transmission in a data session in a communication system including a digital cellular radio network, comprising steps of:

establishing a digital data transmission connection between a calling radio data terminal and a data modem in a network terminating unit connected to a mobile exchange;

transmitting a telephone number of a remote data modem, which has an error correction protocol with an AT command from said calling radio data terminal to said data modem in said network terminating unit;

responding to said command in said data modem by establishing a modem connection between said data modem and said remote data modem;

determining compression parameters for said data session by a handshaking procedure between said data modem and said remote data modem;

transmitting said compression parameters from said data modem to said calling radio data terminal;

transmitting data in a compressed form over said digital data transmission connection using an error correction protocol of the cellular radio network; and

transmitting data in said compressed form over said modem connection using as error correction protocols in both said data modem and said remote modem said error correction protocol of said remote data modem.

12. A communication system including a digital cellular radio network, comprising:

a radio data terminal;

a mobile exchange;

a network terminating unit connected to said mobile exchange;

a data modem in said network terminating unit;

a remote data modem having a telephone number;

call control means for establishing a digital data transmission connection between said radio data terminal when said radio data terminal is a calling radio data terminal, and said data modem in said network terminating unit;

said calling radio data terminal being capable of transmitting a command including said telephone number of said remote data modem to said data modem in said network terminating unit;

said data modem in said network terminating unit being responsive to said command in said data modem for establishing a modem connection between said data modem and said remote data modem;

said data modem in said network terminating unit and said remote data modem being adapted to determine compression parameters for a data session by a handshaking procedure between said data modem and said remote data modem;

said data modem in said network terminating unit being adapted to transmit said compression parameters to said calling radio data terminal;

said system being arranged for transmitting data in a compressed form over said digital data transmission connection using an error correction protocol of the cellular radio network; and

said system being arranged for transmitting data in said compressed form over said modem connection using an error correction protocol of said remote data modem.

13. A communication system including a digital cellular radio network, comprising:

a radio data terminal;

a mobile exchange;

a network terminating unit connected to said mobile exchange;

a data modem in said network terminating unit;

a remote data modem having a telephone number;

call control means for establishing a digital data transmission connection between said radio data terminal when said radio data terminal is a calling radio data terminal, and said data modem in said network terminating unit;

said calling radio data terminal being capable of transmitting said telephone number of said remote data modem with an AT command to said data modem in said network terminating unit;

said data modem in said network terminating unit being responsive to said AT command in said data modem for establishing a modem connection between said data modem and said remote data modem;

said data modem in said network terminating unit and said remote data modem being adapted to determine compression parameters for a data session by a handshaking procedure between said data modem and said remote data modem;

said data modem in said network terminating unit being adapted to transmit said compression parameters to said calling radio data terminal;

said system being arranged for transmitting data in a compressed form over said digital data transmission connection using an error correction protocol of the cellular radio network; and

said system being arranged for transmitting data in said compressed form over said modem connection using an error correction protocol of said remote data modem.

14. A method for data transmission in communication system including a digital cellular radio network, comprising steps of:

establishing a digital data transmission connection between a radio data terminal and a data modem in a network terminating unit connected to a mobile exchange;

establishing a modem connection between said data modem in said network terminating unit and a remote data modem;

determining compression parameters for a data session by a handshaking procedure between said data modem and said remote data modem;

transmitting said compression parameters from said data modem to said radio data terminal;

transmitting data in a compressed form over said digital data transmission connection using an error correction protocol of said cellular radio network; and

transmitting data in said compressed form over said modem connection using an error correction protocol of said remote data modem.

15. A communication system including a digital cellular radio network, comprising:

a radio data terminal;

a mobile exchange;

a network terminating unit connected to said mobile exchange;

a data modem in said network terminating unit;

call control means for establishing a digital data transmission connection between a radio data terminal and said data modem in said network terminating unit;

said data modem in said network terminating unit being capable of establishing a modem connection between said data modem and a remote data modem;

said data modem in said network terminating unit and said remote data modem being adapted to determine compression parameters for a data session by a handshaking procedure between said data modem and said remote data modem;

said data modem in said network terminating unit being adapted to transmit said compression parameters to said calling radio data terminal;

said system being arranged for transmitting data in a compressed form over said digital data transmission connection using an error correction protocol of said cellular radio network; and

said system being arranged for transmitting data in said compressed form over said modem connection using an error correction protocol of said remote data modem.