WO1996011538A2 - System for digital communication - Google Patents

System for digital communication Download PDF

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Publication number
WO1996011538A2
WO1996011538A2 PCT/NL1995/000334 NL9500334W WO9611538A2 WO 1996011538 A2 WO1996011538 A2 WO 1996011538A2 NL 9500334 W NL9500334 W NL 9500334W WO 9611538 A2 WO9611538 A2 WO 9611538A2
Authority
WO
WIPO (PCT)
Prior art keywords
network
protocol
communication
data
transfer
Prior art date
Application number
PCT/NL1995/000334
Other languages
French (fr)
Other versions
WO1996011538A3 (en
Inventor
Theo Hardendood
Original Assignee
Multihouse Automatisering B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Multihouse Automatisering B.V. filed Critical Multihouse Automatisering B.V.
Priority to AU36891/95A priority Critical patent/AU3689195A/en
Publication of WO1996011538A2 publication Critical patent/WO1996011538A2/en
Publication of WO1996011538A3 publication Critical patent/WO1996011538A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/18—Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements

Definitions

  • the invention relates to a system for digital communication of data divided into packets between at least two communication apparatuses via a network, said network comprising at least two media, wherein communication in the network is controlled by a network protocol and communication between said apparatuses is controlled by an apparatus protocol.
  • TCP/IP and MPAK are for instance the apparatus protocol and network protocol respectively.
  • One of the media of the network is, for example, the ether through which radio links are effected, wherein such a network with digital radio links is for instance the MOBITEX network.
  • the network contains a part which is formed by a medium through which transfer of data is only possible at a lesser rate, such as a digital radio network only having available a limited band width, the following problems herein occur.
  • Unabbreviated and complete transfer through the network of data and apparatus protocol information supplemented with the network protocol information results in unnecessarily bulky packets, since at least some of the functions of the apparatus protocol are likewise executed by the network protocol, wherein the cost of the transfer through the network is directly proportional to the number of packets for transfer and the size of these packets.
  • the invention has for its object to obviate the above stated drawbacks and provides to this end a system which is distinguished in that between the network and at least one of the apparatuses is placed a gate device which is adapted to code or decode the apparatus protocol information contained in a packet together with the data for transfer and to add network protocol information to the packet or remove it therefrom.
  • the transferring apparatus will expect under the apparatus protocol a confirmation sent within a predetermined time by the receiving apparatus to acknowledge receipt of a transmitted packet, wherein the transferring apparatus will transmit the relevant packet again when such a confirmation is not received within this time.
  • This time duration is however usually geared to transfer of packets between communication apparatuses via a network with high transfer rates, for instance a local area network with fixed cable connections such as the datanet or the internet. Since both the packet and a confirmation to acknowledge receipt thereof are transferred through the slower part of the network at a speed lower than the transfer rate to which the repetition time of the apparatus protocol is geared, such a confirmation will not reach the transferring apparatus in good time to prevent repeated transmission of the relevant packet.
  • the gate device is adapted to send to an apparatus a confirmation to acknowledge receipt of a packet transmitted by this apparatus and to transfer the packet to the network for further transmission to the destination apparatus.
  • a system according to the present invention therefore has the advantage that the size of packets for transfer is limited and unnecessarily repeated transmission of packets is prevented.
  • fig. 1 shows a schematic view of a system according to the present invention
  • fig. 2 shows a schematic view of a local area network
  • fig. 3 shows a schematic view of a packet to be transferred by the system shown in fig. 1.
  • the embodiment of the invention shown in fig. 1 comprises: communication apparatuses formed by mobile stations 1 and another communication apparatus 12; a network 13, which network 13 comprises: transmitting and receiving stations 3; fixed cable connections 4; local nodes 5; regional nodes 6; and a central node 7; and a gate device 8 placed between the network 13 and the communication apparatus 12.
  • the mobile stations 1 are in contact with the transmitting and receiving stations by means of a radio link 3, wherein a limited band width is available for this radio link, which imposes a limitation on the transfer rate between the mobile stations 1 and the transmitting and receiving stations 3.
  • the transmitting and receiving stations 3 are each connected by means of fixed cable connections to a local node 5. It is noted here, that a local node can be connected to a plurality of transmitting and receiving stations 3. Three local nodes 5 are herein connected to a regional node 6 by means of fixed cable connections 4, wherein in the case shown two nodes 6 are connected in turn to a central node 7 by means of fixed cable connections 4.
  • An example of such a network with a hierarchical branch structure is the MOBITEX network which is particularly suitable for transferring packets of digital data, which packets together form a message. A description follows below wherein the message is transferred from a communication apparatus 12 via the network 13 to the mobile station 1.
  • the communication apparatuses 12 are formed in the embodiment of the invention shown here by storage means for storing and retrieving data, wherein at the request of mobile stations 1 these means transmit requested data from their files to the mobile stations 1 via the network 13.
  • the making of the connection, retrieval of data from the files of servers, transmitting of the retrieved data etc. is controlled by an apparatus protocol such as the TCP/IP protocol which in practice has become a standard protocol for transfer of packets of digital data between communication apparatuses.
  • an apparatus protocol, and in particular the TCP/IP protocol is however particularly suitable for such a transfer via a network of fixed cable connections, for instance a local area network such as the ethernet or the datanet, wherein due to the high transfer rates problems are caused by a slower medium acting as a bottleneck in the network 13.
  • Transfer in network 13 is therefore controlled by a separate network protocol such as the PAK protocol.
  • a gate device 8 is arranged in the system according to the present invention, wherein a processing unit present in the gate device codes only the necessary apparatus protocol information and removes the rest and subsequently adds the network protocol information. Since correct transfer of packets through the network under the control of the network protocol is already ensured, it is for instance not necessary to also transfer separate information for this purpose in the apparatus protocol information.
  • the gate device immediately after receiving a packet, the gate device sends back a confirmation to acknowledge receipt to the transmitting communication apparatus 12, which is permitted since correct transfer is already ensured under the network protocol.
  • the non-coded apparatus protocol information is transferred through the network once in a first packet together with the key, thus enabling decoding by the mobile station 1 of coded apparatus protocol information in following packets. It is especially notable here that the information regarding the origin and the destination in the apparatus protocol information is coded by gate device 8 to a single session code from which the mobile station 1 can identify and receive a packet transmitted thereafter.
  • the gate device is further provided with means for compressing the data, thereby realizing a further reduction in the number of packets for transfer and/or the size of the packets for transfer.
  • Use can be made for this purpose of a compression algorithm which is particularly suitable for the mobile station 1 and which is supplied to gate device 8 from a communication apparatus 12, or of a compression algorithm already present in the gate device.
  • the gate device 8 is transparent for the communication apparatuses so that the latter can operate with the same apparatus protocol irrespective of whether or not the gate device 8 is present.
  • another gate device forms a unit with a mobile station 1, wherein this gate device removes the network protocol information and decodes the apparatus protocol information.
  • an additional network is situated on the destination side of the radio link 2 instead of the mobile stations 1 shown here.
  • a network can take a form similar to the network shown in fig. 1 between the radio link 2 and the fixed cable connection 9. It is further conceivable that the network 13 contains mutual connections between local nodes 5 and/or mutual connections between the regional nodes 6.
  • the route covered by the packets is not fixed and the sequence of arrival can vary from the sequence in which the packets are transmitted as a result of different "transmission times". It will be apparent that other network configurations can also be applied. Shown in fig. 2 are: the network 12; cable connection 9; gate device 8; cable connections 10; and communication apparatuses 11a, lib and lie.
  • the communication apparatuses lla, lib and lie are for instance provided with databases, wherein a policeman can for instance retrieve from these nationally accessible databases data relating to the number plates of a car or the personal details of someone who has been detained, or wherein an employee or representative of a company can for instance retrieve from these databases placed on the company premises data relating to stock, delivery times or prices.
  • a selection device 14 herein provides the connection between the network 13 and one of the communication apparatuses lla, lib or lie via the gate device 8.
  • Shown schematically in fig. 3 is the format of a packet 20 for transfer, which packet 20 comprises a part A containing protocol information and a part B containing the data for transfer.
  • the part A of packet 20 contains a block 21 of network protocol information for the MPAK protocol and two blocks 22, 23 for the apparatus protocol information of respectively the TCP protocol and the IP protocol.
  • the whole part B of packet 20 is taken up by a block 24 with data for transfer.
  • the packet 20 When a packet 20 is transferred between a communication apparatus 12 and the gate device 8 the packet 20 does not contain a block 21 with the network protocol information.
  • the block 21 containing information for the MPAK network protocol will have been added, the blocks 22, 23 containing respectively TCP apparatus protocol information and IP apparatus protocol information will have been coded by gate device 8 and the block 24 of packet 20 containing data for transfer will have been compressed by the gate device 8.

Abstract

The invention relates to a system for digital communication of data divided into packets between at least two communication apparatuses via a network, said network comprising at least two media, wherein communication in the network is controlled by a network protocol and communication between the apparatuses is controlled by an apparatus protocol. Unabbreviated and complete transfer through the network of data and apparatus protocol information supplemented with network protocol information results in unnecessarily bulky packets, since at least some of the functions of the apparatus protocol are likewise executed by the network protocol, wherein the cost of the transfer through the network is directly proportional to the number of packets for transfer and the size of these packets. The invention has for its object to obviate the above stated drawbacks and provides to this end a system which is distinguished in that between the network and at least one of the apparatuses is placed a gate device (8) which is adapted to code or decode the apparatus protocol information contained in a packet together with the data for transfer and to add network protocol information to the packet or remove it therefrom, and the system is further distinguished in that the gate device is adapted to transmit to an apparatus a confirmation to acknowledge receipt of a packet transmitted by this apparatus and to transfer the packet to the network for further transmission to the destination apparatus.

Description

SYSTEM FOR DIGITAL COMMUNICATION
The invention relates to a system for digital communication of data divided into packets between at least two communication apparatuses via a network, said network comprising at least two media, wherein communication in the network is controlled by a network protocol and communication between said apparatuses is controlled by an apparatus protocol.
It is known in the art to make use of a system wherein the data to be transferred from apparatus to apparatus and the apparatus protocol information are transferred in full and unabbreviated through the network. For this transfer through the network the packet is simply supplemented with the network protocol information required for this purpose. TCP/IP and MPAK are for instance the apparatus protocol and network protocol respectively. One of the media of the network is, for example, the ether through which radio links are effected, wherein such a network with digital radio links is for instance the MOBITEX network.
In the case that the network contains a part which is formed by a medium through which transfer of data is only possible at a lesser rate, such as a digital radio network only having available a limited band width, the following problems herein occur.
Unabbreviated and complete transfer through the network of data and apparatus protocol information supplemented with the network protocol information results in unnecessarily bulky packets, since at least some of the functions of the apparatus protocol are likewise executed by the network protocol, wherein the cost of the transfer through the network is directly proportional to the number of packets for transfer and the size of these packets. The invention has for its object to obviate the above stated drawbacks and provides to this end a system which is distinguished in that between the network and at least one of the apparatuses is placed a gate device which is adapted to code or decode the apparatus protocol information contained in a packet together with the data for transfer and to add network protocol information to the packet or remove it therefrom.
In many known systems the transferring apparatus will expect under the apparatus protocol a confirmation sent within a predetermined time by the receiving apparatus to acknowledge receipt of a transmitted packet, wherein the transferring apparatus will transmit the relevant packet again when such a confirmation is not received within this time. This time duration is however usually geared to transfer of packets between communication apparatuses via a network with high transfer rates, for instance a local area network with fixed cable connections such as the datanet or the internet. Since both the packet and a confirmation to acknowledge receipt thereof are transferred through the slower part of the network at a speed lower than the transfer rate to which the repetition time of the apparatus protocol is geared, such a confirmation will not reach the transferring apparatus in good time to prevent repeated transmission of the relevant packet. The cost of transferring the packets hereby rises unnecessarily and there is the danger of the network becoming overloaded. In accordance with the above the system is further distinguished in that the gate device is adapted to send to an apparatus a confirmation to acknowledge receipt of a packet transmitted by this apparatus and to transfer the packet to the network for further transmission to the destination apparatus.
A system according to the present invention therefore has the advantage that the size of packets for transfer is limited and unnecessarily repeated transmission of packets is prevented.
The invention is further elucidated with reference to the figure description of an embodiment of the invention following hereinbelow. In the drawing: fig. 1 shows a schematic view of a system according to the present invention; fig. 2 shows a schematic view of a local area network; and fig. 3 shows a schematic view of a packet to be transferred by the system shown in fig. 1.
The embodiment of the invention shown in fig. 1 comprises: communication apparatuses formed by mobile stations 1 and another communication apparatus 12; a network 13, which network 13 comprises: transmitting and receiving stations 3; fixed cable connections 4; local nodes 5; regional nodes 6; and a central node 7; and a gate device 8 placed between the network 13 and the communication apparatus 12. The mobile stations 1 are in contact with the transmitting and receiving stations by means of a radio link 3, wherein a limited band width is available for this radio link, which imposes a limitation on the transfer rate between the mobile stations 1 and the transmitting and receiving stations 3.
The transmitting and receiving stations 3 are each connected by means of fixed cable connections to a local node 5. It is noted here, that a local node can be connected to a plurality of transmitting and receiving stations 3. Three local nodes 5 are herein connected to a regional node 6 by means of fixed cable connections 4, wherein in the case shown two nodes 6 are connected in turn to a central node 7 by means of fixed cable connections 4. An example of such a network with a hierarchical branch structure is the MOBITEX network which is particularly suitable for transferring packets of digital data, which packets together form a message. A description follows below wherein the message is transferred from a communication apparatus 12 via the network 13 to the mobile station 1.
The communication apparatuses 12 are formed in the embodiment of the invention shown here by storage means for storing and retrieving data, wherein at the request of mobile stations 1 these means transmit requested data from their files to the mobile stations 1 via the network 13. The making of the connection, retrieval of data from the files of servers, transmitting of the retrieved data etc. is controlled by an apparatus protocol such as the TCP/IP protocol which in practice has become a standard protocol for transfer of packets of digital data between communication apparatuses. Such an apparatus protocol, and in particular the TCP/IP protocol, is however particularly suitable for such a transfer via a network of fixed cable connections, for instance a local area network such as the ethernet or the datanet, wherein due to the high transfer rates problems are caused by a slower medium acting as a bottleneck in the network 13. Transfer in network 13 is therefore controlled by a separate network protocol such as the PAK protocol. In contrast to the known art, wherein network protocol information is simply added to the packet consisting of apparatus protocol information and data, a gate device 8 is arranged in the system according to the present invention, wherein a processing unit present in the gate device codes only the necessary apparatus protocol information and removes the rest and subsequently adds the network protocol information. Since correct transfer of packets through the network under the control of the network protocol is already ensured, it is for instance not necessary to also transfer separate information for this purpose in the apparatus protocol information.
Also, immediately after receiving a packet, the gate device sends back a confirmation to acknowledge receipt to the transmitting communication apparatus 12, which is permitted since correct transfer is already ensured under the network protocol.
In addition, the non-coded apparatus protocol information is transferred through the network once in a first packet together with the key, thus enabling decoding by the mobile station 1 of coded apparatus protocol information in following packets. It is especially notable here that the information regarding the origin and the destination in the apparatus protocol information is coded by gate device 8 to a single session code from which the mobile station 1 can identify and receive a packet transmitted thereafter.
The gate device is further provided with means for compressing the data, thereby realizing a further reduction in the number of packets for transfer and/or the size of the packets for transfer. Use can be made for this purpose of a compression algorithm which is particularly suitable for the mobile station 1 and which is supplied to gate device 8 from a communication apparatus 12, or of a compression algorithm already present in the gate device. In all functions the gate device 8 is transparent for the communication apparatuses so that the latter can operate with the same apparatus protocol irrespective of whether or not the gate device 8 is present.
In the embodiment of the invention shown in fig. 1 another gate device forms a unit with a mobile station 1, wherein this gate device removes the network protocol information and decodes the apparatus protocol information.
According to another embodiment in accordance with the present invention an additional network is situated on the destination side of the radio link 2 instead of the mobile stations 1 shown here. Such a network can take a form similar to the network shown in fig. 1 between the radio link 2 and the fixed cable connection 9. It is further conceivable that the network 13 contains mutual connections between local nodes 5 and/or mutual connections between the regional nodes 6. When packets forming a message are transferred via such a network the route covered by the packets is not fixed and the sequence of arrival can vary from the sequence in which the packets are transmitted as a result of different "transmission times". It will be apparent that other network configurations can also be applied. Shown in fig. 2 are: the network 12; cable connection 9; gate device 8; cable connections 10; and communication apparatuses 11a, lib and lie.
The communication apparatuses lla, lib and lie are for instance provided with databases, wherein a policeman can for instance retrieve from these nationally accessible databases data relating to the number plates of a car or the personal details of someone who has been detained, or wherein an employee or representative of a company can for instance retrieve from these databases placed on the company premises data relating to stock, delivery times or prices.
A selection device 14 herein provides the connection between the network 13 and one of the communication apparatuses lla, lib or lie via the gate device 8. Shown schematically in fig. 3 is the format of a packet 20 for transfer, which packet 20 comprises a part A containing protocol information and a part B containing the data for transfer.
In the embodiment shown in fig. 1 and fig. 2 the part A of packet 20 contains a block 21 of network protocol information for the MPAK protocol and two blocks 22, 23 for the apparatus protocol information of respectively the TCP protocol and the IP protocol. The whole part B of packet 20 is taken up by a block 24 with data for transfer.
When a packet 20 is transferred between a communication apparatus 12 and the gate device 8 the packet 20 does not contain a block 21 with the network protocol information. When a packet 20 is transferred from gate device 8 through the network 13, the block 21 containing information for the MPAK network protocol will have been added, the blocks 22, 23 containing respectively TCP apparatus protocol information and IP apparatus protocol information will have been coded by gate device 8 and the block 24 of packet 20 containing data for transfer will have been compressed by the gate device 8.

Claims

1. System for digital communication of data divided into packets between at least two communication apparatuses via a network, which network comprises at least two media, wherein communication in the network is controlled by a network protocol and communication between the apparatuses is controlled by an apparatus protocol, characterized in that between the network and at least one of the apparatuses is placed a gate device which is adapted to code or decode the apparatus protocol information contained in a packet together with the data for transfer and to add network protocol information to the packet or remove it therefrom.
2. System for data communication as claimed in claim 1, characterized in that the gate device is adapted to transmit complete coding information once through the network to a memory means in the destination apparatus or in a gate device on the destination side.
3. System for data communication as claimed in claim 1 or 2, characterized in that one or more than one apparatus forms a unit with a gate device. . System for data communication as claimed in claim 1 or 2 , characterized in that the gate device is adapted to convert the origin information and the destination information in the apparatus protocol information into a single session code.
5. System for data communication as claimed in claim 1, characterized in that the gate device is adapted to send to an apparatus a confirmation of reception of a packet transmitted by this apparatus and to transfer the packet to the network for further transmission to the destination apparatus.
6. System for data communication as claimed in claim 1, characterized in that the gate device is adapted to code the data for transfer. 7. System for data communication as claimed in claim 1 or 6, characterized in that the gate device is adapted to execute the coding in accordance with a coding algorithm chosen or supplied by a user. 8. System for data communication as claimed in claim 1, characterized in that the communication apparatuses are adapted to communicate under the control of the TCP/IP protocol particularly suitable for a local area network. 9. System for data communication as claimed in claim 1 or 8, characterized in that at least one of the apparatuses is formed by a network of communication equipment.
10. System for data communication as claimed in claim 1, characterized in that at least a part of the network is formed by a digital radio network.
11. System for data communication as claimed in claim 1 or 10, characterized in that the network is adapted to communicate under the control of the MPAK protocol particularly suitable for a digital radio network.
12. System for data communication as claimed in claim 1, 10 or 11, characterized in that the network is adapted to effect error-free transfer of data by means of a check sum in only the MPAK protocol.
13. Gate device for use in a system as claimed in one or more than one of the foregoing claims, which gate device comprises: a processing unit, a memory means, input and output means for connection to one or more than one communication apparatus or to one or more than one other network, characterized in that the gate device is adapted to code or decode the apparatus protocol information placed in a packet together with the data for transfer and to add network protocol information to the packet or remove it therefrom.
14. Packet of data and protocol information for digital communication in a system as claimed in one or more than one of the foregoing claims, characterized in that during transfer between a communication apparatus and a gate device the packet comprises complete information for the apparatus protocol and the complete data for transfer, and that during transfer through the network the packet comprises complete information for the network protocol, coded information for the apparatus protocol and coded data, wherein the first packet for transfer through the network further contains the coding information.
PCT/NL1995/000334 1994-10-04 1995-10-03 System for digital communication WO1996011538A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU36891/95A AU3689195A (en) 1994-10-04 1995-10-03 System for digital communication

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9401626A NL9401626A (en) 1994-10-04 1994-10-04 Digital communication system.
NL9401626 1994-10-04

Publications (2)

Publication Number Publication Date
WO1996011538A2 true WO1996011538A2 (en) 1996-04-18
WO1996011538A3 WO1996011538A3 (en) 1996-08-01

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WO (1) WO1996011538A2 (en)

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US8121296B2 (en) 2001-03-28 2012-02-21 Qualcomm Incorporated Method and apparatus for security in a data processing system
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Cited By (9)

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Publication number Priority date Publication date Assignee Title
WO2002080488A2 (en) * 2001-03-28 2002-10-10 Qualcomm Incorporated Method and apparatus for transmission framing in a wireless communication system
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US8121296B2 (en) 2001-03-28 2012-02-21 Qualcomm Incorporated Method and apparatus for security in a data processing system
US8713400B2 (en) 2001-10-12 2014-04-29 Qualcomm Incorporated Method and system for reduction of decoding complexity in a communication system
US8730999B2 (en) 2001-10-12 2014-05-20 Qualcomm Incorporated Method and system for reduction of decoding complexity in a communication system
US8971790B2 (en) 2003-01-02 2015-03-03 Qualcomm Incorporated Method and apparatus for broadcast services in a communication system
US8098818B2 (en) 2003-07-07 2012-01-17 Qualcomm Incorporated Secure registration for a multicast-broadcast-multimedia system (MBMS)
US8718279B2 (en) 2003-07-08 2014-05-06 Qualcomm Incorporated Apparatus and method for a secure broadcast system
US8724803B2 (en) 2003-09-02 2014-05-13 Qualcomm Incorporated Method and apparatus for providing authenticated challenges for broadcast-multicast communications in a communication system

Also Published As

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WO1996011538A3 (en) 1996-08-01
NL9401626A (en) 1996-05-01
AU3689195A (en) 1996-05-02

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