WO2000041420A1 - Procede de transmission de donnees entre une station de base et un centre de commutation mobile - Google Patents

Procede de transmission de donnees entre une station de base et un centre de commutation mobile Download PDF

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Publication number
WO2000041420A1
WO2000041420A1 PCT/SE1999/002355 SE9902355W WO0041420A1 WO 2000041420 A1 WO2000041420 A1 WO 2000041420A1 SE 9902355 W SE9902355 W SE 9902355W WO 0041420 A1 WO0041420 A1 WO 0041420A1
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WO
WIPO (PCT)
Prior art keywords
data
information
speech
ttl
base station
Prior art date
Application number
PCT/SE1999/002355
Other languages
English (en)
Inventor
Birgitta SJÖQVIST-ERIKSSON
Ingemar Johansson
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
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 Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to AU21340/00A priority Critical patent/AU2134000A/en
Priority to JP2000593047A priority patent/JP2002534928A/ja
Priority to EP99965648A priority patent/EP1142388A1/fr
Priority to KR1020017008397A priority patent/KR20010103732A/ko
Publication of WO2000041420A1 publication Critical patent/WO2000041420A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1682—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/045—Interfaces between hierarchically different network devices between access point and backbone network device

Definitions

  • the present invention relates generally to radio communication systems and, more particularly, to a system and method for integrating speech, fax/modem and packet data in a cost-effective manner.
  • packet data protocols which are more suitable for transmission of data than circuit-switched protocols, has started to find its way into cellular communication systems.
  • packet-switched networks are preferred for providing a mobile packet data service, which are defined by such standards as General Packet Radio Service (GPRS), Cellular Digital Packet Data (CDPD) and Personal Digital Cellular (PDC).
  • GPRS General Packet Radio Service
  • CDPD Cellular Digital Packet Data
  • PDC Personal Digital Cellular
  • each packet of data contains a destination address which provides for fast set up and allows multiple users to share a radio resource. Packet service integration in both Global System for Mobile communication
  • GSM Global System for Mobile Communications
  • CD- AMPS Digital Advanced Mobile Phone System
  • GSM systems provide a circuit-switched data service, which can be used to interconnect with external data networks.
  • the circuit-switched data service is used for both circuit- switched as well as packet-switched data communication.
  • GPRS General Packet Radio Services
  • GPRS General Packet Radio Services
  • GPRS will allow for packet-switched communication and will support both a connectionless protocol (e.g., IP) as well as a connection-oriented protocol (e.g., X.25). Every channel is configured for either circuit-switched or packet-switched traffic.
  • IP connectionless protocol
  • connection-oriented protocol e.g., X.25
  • Every channel is configured for either circuit-switched or packet-switched traffic.
  • One of the advantages with a packet-switched data communication protocol is that a single transmission resource can be shared between a number of users.
  • a timeslot on a radio frequency carrier can be utilized by several mobile users for reception and transmission of data.
  • the shared transmission resource is managed by the network side of the cellular system both for downlink and uplink transmissions.
  • Figure 1 illustrates an exemplary radio frequency band supporting both circuit-switched and packet-switched traffic in a GPRS system.
  • the exemplary radio frequency band as illustrated in Figure 1, is divided into 8 timeslots.
  • a timeslot can support a single speech call, a single fax/modem call, or one or more packet data users.
  • timeslot 1 is assigned to speech call 1 and timeslot 2 is shared by GPRS users 1-3.
  • GPRS is very flexible in that it allows for the integration of both speech and packet data traffic on a single carrier. However, it also requires considerably more bandwidth than other packet data systems. GPRS requires 25 KHz per timeslot compared to 10 KHz per timeslot for other systems (e.g., CDPD).
  • the CDPD system which is part of D-AMPS, and the PDC system set forth different approaches than that described above for providing packet data communications.
  • specific base stations are dedicated to handling packet data transmissions. As such, speech and packet data traffic are not mixed.
  • a base station comprises separate transceivers for handling packet data communications. As with the CDPD system, speech and packet data traffic are not mixed.
  • Conventional approaches for providing packet data have failed to efficiently integrate packet data, speech and fax/modem traffic.
  • conventional system In an attempt to provide both packet data and speech communications, conventional system have dedicated specific base stations, transceivers and channels for handling packet data transmissions. As a result, communication resources are inefficiently utilized.
  • these conventional approaches have resulted in systems which are not cost-effective.
  • the present invention seeks to overcome the above-identified deficiencies by providing a system and method for merging packet data, speech and fax/modem communications within the same communication protocol.
  • the unused Mode Code values of a conventional TTL frame are tailored so as to allow for the integration of packet data together with speech and fax/modem in a TTL frame. As a result, communication resources are more efficiently utilized.
  • Figure 1 illustrates an exemplary radio frequency band supporting both circuit-switched and packet-switched traffic in a GPRS system
  • Figure 2 illustrates a conventional PDC radio communication system
  • Figure 3 illustrates the base station 210 and MSC 220 of Figure 2 in more detail
  • FIG. 4 illustrates a conventional TTL frame which can contain either speech and/or fax/modem information or packet data information
  • Figure 5 illustrates a base station and MSC according to exemplary embodiments of the present invention.
  • Figure 2 illustrates a conventional PDC radio communication system.
  • the conventional system includes a plurality of mobile stations (MS)
  • a base station (BS) 210 a mobile services switching center (MSC) 220, a packet mobile services switching center (PMSC) 230 which is connected to a packet network 250, such as the Internet, and a public switched telephone network (PSTN) 240.
  • PSTN public switched telephone network
  • the plurality of mobile stations 200 r 200 N communicate with base station 210 in a well known manner.
  • Each of mobile stations 200,-200 N is capable of transmitting speech, fax/modem data and/or packet data.
  • the base station 210 receives information from the mobile stations via transceivers, processes the information and forwards the processed information to the MSC 220.
  • the base station 210 also receives information from MSC 220 and transfers such information to one or more mobile stations.
  • the base station comprises separate transceivers for handling speech and fax/modem communications and for handling packet data communications.
  • the MSC 220 information from the base station 210 is routed to its destination (i.e., the PSTN 240 when the information is speech or fax/modem data and through the PMSC 230 to its destination on the packet data network 250 when the information is packet data).
  • the network illustrated in Figure 2 would typically include other components, such as routers (not shown), which aid in the reception, processing and transmission of information in the network.
  • the number of components depicted in Figure 2 is provided merely for the sake of simplicity.
  • Radio communication systems generally include multiple base stations, MSCs, PMSCs, etc.
  • Figure 3 illustrates the base station 210 and MSC 220 of Figure 2 in more detail.
  • the base station 210 comprises two transceivers, TRX 212 and TRX 213, which receive information from and transmit information to mobile stations 200 200 N via antennas 215 and 216, respectively.
  • One of the transceivers for example TRX 212, handles only packet data communications while the other transceiver, TRX 213, handles communications which involve speech and fax/modem transmissions.
  • Base station 210 also comprises a control unit (CU) 214 for controlling the routing of information over the wire line 250 that connects the base station 210 and the MSC 220.
  • CU control unit
  • the MSC 220 comprises a transcoder and rate adapter board (TRAB) 222 which processes information received in the MSC 220 in a well known manner.
  • TRAB 222 is associated with transceiver 213.
  • TRX 212 processes speech and modem/fax information and transfers and receives information from the PSTN 240.
  • TRX 212 is not associated with a TRAB. As such, TRX 212 is almost directly connected to the PMSC 230.
  • the MSC 220 also includes exchange terminal circuits 221, 224 and 225 which operate as switches for transferring data to its appropriate destination.
  • base station 210 comprises a transceiver, TRX 213, for handling speech and fax/modem communications and a transceiver, TRX 212, for handling packet data communications.
  • Transceivers 212 and 213 communicate with MSC via wire line 250. Communications between TRX 213 and TRAB 222 are made using the TTL protocol.
  • the TTL protocol is described in detail in the document entitled “Signal Description, TRA-TRX with IMUX/HR," 10/15 14- ANT 244 02, Rev. A, which is incorporated by reference herein and attached as Appendix A. Communications between the TRX 212 and the PMSC 230, on the other hand, are made using a different protocol (referred to hereinafter as the
  • FIG. 4 illustrates a conventional TTL frame which can contain speech and/or fax/modem information.
  • the conventional TTL frame comprises a header field which contains, among other things, synchronization information, two sub-frames and a tail frame.
  • Each sub-frame comprises three TTL-individuals and an extension field.
  • the term "TTL-individual" is used to designate the TTL resource being allocated to a particular TRX and TRAB pair.
  • Each TTL-individual comprises a data field and a control field.
  • Each data field of a particular frame includes, as set forth above, speech and/or fax/modem information.
  • Each control field of a TTL-individual comprises the following sub- fields: a Quality Information sub-field, a Dummy Data Indication sub-field, a Mode Code sub-field, and a Cyclic Redundancy Check (CRC) sub-field.
  • CRC Cyclic Redundancy Check
  • Mode Code sub-field was used in the TTL protocol to identify /distinguish between different types and rates of service.
  • the coding of the conventional Mode Code sub-field is provided below in Table 1.
  • the conventional TTL protocol does not make use of Mode Code values 8-14. As a result, these values are available for adapting the TTL protocol for future services. Table 1
  • A-S/FR indicates an Active-Speech full rate mode
  • A-S/HR indicates an Active-Speech half rate mode
  • T-C/FR indicates a Through-Connect full rate mode
  • T-C/HR indicates a Through-Connect half rate mode
  • N-S/FR indicates a Non-Speech full rate mode
  • N-S/HR indicates a Non-Speech half rate mode.
  • the conventional TTL protocol does not provide the ability to integrate speech and packet data information in a single TTL frame.
  • TTL frames are dedicated to speech and/or fax/modem information resulting in transceivers, which act together with TRABs, being dedicated to only speech and/or fax/modem information.
  • FIG. 5 illustrates a base station 310 and MSC 320 according to exemplary embodiments of the present invention.
  • the base station 310 includes two transceivers TRX 312 and TRX 313, which communicate with one or more mobile stations via antennas 315 and 316, respectively.
  • both transceivers 312 and 313 are capable of handling packet data, speech and fax/modem communications.
  • the control unit (CU) 314 controls the transfer of information over the wire line 250 that connects the base station 310 and the MSC 320.
  • the exemplary MSC 320 comprises two transcoder and rate adapter boards, TRAB 322 and TRAB 323.
  • both TRAB 322 and TRAB 323 are capable of handling packet data, speech and fax/modem information.
  • each TRAB is connected to both the PMSC 230 and the PSTN 240.
  • the TRABs process the information in a well known manner.
  • the TRAB simply routes the data to its intended destination.
  • the conventional TRAB could be modified to perform the above-identified functionality via software reprograrnming.
  • base station 310 and MSC 320 communicate using the TTL protocol.
  • the TTL protocol allows for packet data, speech and fax/modem communications to be integrated within a single TTL frame.
  • the present invention utilizes the unused Mode Code values 8-13 of a TTL-individual control field to indicate packet data information.
  • Table 2 illustrates new Mode Codes for values 8-13 of the TTL protocol.
  • Mode Codes are merely exemplary and that the Mode Codes could be tailored in other ways so as to meet specific network needs.
  • a base station wants to transfer speech information, which would occupy the data fields of four TTL individuals, and packet data, with an information bandwidth which would fit into the data fields of two TTL individuals, to the MSC.
  • the speech information and packet data would have to be transferred in separate MSC-to-BS channels, where one TRAB-TRX pair is involved in the speech transmission and another TRX is involved in the packet data transmission.
  • a single TRX-TRAB pair and a single MSC-to-BS channel can be used to transmit both the speech information and the packet data.
  • the modification to the TTL protocol would allow for the transmission of packet data along with speech and/or fax/modem information in a TTL frame.
  • the above-described system and method for integrating packet data, speech and fax/modem communications within a single TTL frame is both easy to implement and cost-effective.
  • This packet data/speech/fax/modem integration procedure can be implemented through software programming without the need for replacing hardware components.
  • the present invention makes more efficient use of information bandwidth.
  • the present invention also allows for a single transceiver to be configured to handle packet data, speech and fax/modem communications, thereby eliminating the need for dedicated transceivers. As a result, the present invention makes efficient use of communication resources.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)

Abstract

L'invention concerne un système et un procédé permettant de fusionner des paquets de données, de parole et des communications de fax/modem dans le même protocole de communication. Selon des modes de réalisation mentionnés de l'invention, les valeurs de code de mode non utilisées d'une trame TTL classique sont personnalisées manière à permettre l'intégration de paquets de données à la parole et au fax/modem dans une trame TTL. Il en résulte une utilisation plus efficace des ressources.
PCT/SE1999/002355 1998-12-31 1999-12-14 Procede de transmission de donnees entre une station de base et un centre de commutation mobile WO2000041420A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU21340/00A AU2134000A (en) 1998-12-31 1999-12-14 Data transmission method between base station and mobile switching center
JP2000593047A JP2002534928A (ja) 1998-12-31 1999-12-14 基地局と移動交換局との間のデータ送信方法
EP99965648A EP1142388A1 (fr) 1998-12-31 1999-12-14 Procede de transmission de donnees entre une station de base et un centre de commutation mobile
KR1020017008397A KR20010103732A (ko) 1998-12-31 1999-12-14 기지국과 이동 교환국 간의 데이터 전송 방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US22480298A 1998-12-31 1998-12-31
US09/224,802 1998-12-31

Publications (1)

Publication Number Publication Date
WO2000041420A1 true WO2000041420A1 (fr) 2000-07-13

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PCT/SE1999/002355 WO2000041420A1 (fr) 1998-12-31 1999-12-14 Procede de transmission de donnees entre une station de base et un centre de commutation mobile

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EP (1) EP1142388A1 (fr)
JP (1) JP2002534928A (fr)
KR (1) KR20010103732A (fr)
CN (1) CN1332941A (fr)
AU (1) AU2134000A (fr)
WO (1) WO2000041420A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100514144B1 (ko) * 2002-10-29 2005-09-08 엘지전자 주식회사 이동통신 시스템에서의 음성 및 패킷 데이터 동시 서비스방법
KR100633102B1 (ko) * 2004-01-27 2006-10-12 삼성전자주식회사 단일세션을 이용하는 패킷을 병합전송하는 무선 네트워크단말장치 및 그 전송방법

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998021841A1 (fr) * 1996-11-14 1998-05-22 Telefonaktiebolaget Lm Ericsson (Publ) Procede pour multiplexer des liaisons adjacentes emetteur-recepteur/transcodeur en une seule voie temporelle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998021841A1 (fr) * 1996-11-14 1998-05-22 Telefonaktiebolaget Lm Ericsson (Publ) Procede pour multiplexer des liaisons adjacentes emetteur-recepteur/transcodeur en une seule voie temporelle

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DUNLOP J ET AL: "DEVELOPMENT OF A HYBRID TRANSMISSION SYSTEM FOR MIXED VOICE AND DATA SERVICES FOR 3RD GENERATION DIGITAL MOBILE RADIO", PROCEEDINGS OF THE NORDIC SEMINAR ON DIGITAL MOBILE RADIO COMMUNICATIONS, HELSINKI, DEC. 1 - 3, 1992, no. SEMINAR 5, 1 December 1992 (1992-12-01), TELECOM FINLAND, pages 381 - 388, XP000458678 *
LEE A Y ET AL: "ARCHITECTURE AND PERFORMANCE ANALYSIS OF PACKET-BASED MOBILE SWITCHING CENTER-TO-BASE STATION TRAFFIC COMMUNICATIONS FOR TDMA", BELL LABS TECHNICAL JOURNAL, vol. 2, no. 3, 21 June 1997 (1997-06-21), pages 46 - 56, XP000703740 *

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JP2002534928A (ja) 2002-10-15
AU2134000A (en) 2000-07-24
KR20010103732A (ko) 2001-11-23
CN1332941A (zh) 2002-01-23
EP1142388A1 (fr) 2001-10-10

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