NO319965B1 - Procedure for Reducing Time Delay in a Telephone System - Google Patents

Procedure for Reducing Time Delay in a Telephone System Download PDF

Info

Publication number
NO319965B1
NO319965B1 NO20034333A NO20034333A NO319965B1 NO 319965 B1 NO319965 B1 NO 319965B1 NO 20034333 A NO20034333 A NO 20034333A NO 20034333 A NO20034333 A NO 20034333A NO 319965 B1 NO319965 B1 NO 319965B1
Authority
NO
Norway
Prior art keywords
tdm
base station
analyzer
station system
calls
Prior art date
Application number
NO20034333A
Other languages
Norwegian (no)
Other versions
NO20034333D0 (en
NO20034333L (en
Inventor
Trygve Sten Gustavsen
Knut Fjellheim
Svein Haglund
Trond Hogsaas
Knut Einar Refstie
Kjetil Kjellstali
Sjur Thomas Lien
Original Assignee
Maritime Comm Partner As
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 Maritime Comm Partner As filed Critical Maritime Comm Partner As
Priority to NO20034333A priority Critical patent/NO319965B1/en
Publication of NO20034333D0 publication Critical patent/NO20034333D0/en
Priority to EP04775071A priority patent/EP1668795A1/en
Priority to PCT/NO2004/000288 priority patent/WO2005032002A1/en
Publication of NO20034333L publication Critical patent/NO20034333L/en
Publication of NO319965B1 publication Critical patent/NO319965B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • H04B7/18543—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for adaptation of transmission parameters, e.g. power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • 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
    • H04W92/14—Interfaces between hierarchically different network devices between access point controllers and backbone network device

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephone Function (AREA)

Description

FREMGANGSMÅTE FOR Å REDUSERE TIDSFORSINKELSE I ET TELEFONSYSTEM METHOD FOR REDUCING TIME DELAY IN A TELEPHONE SYSTEM

Denne oppfinnelse vedrører en fremgangsmåte for å redusere tidsforsinkelse i et telefonsystem. Nærmere bestemt dreier det seg om en fremgangsmåte for å redusere den hørbare tidsforsinkelsen som oppstår når signalene sendes for eksempel via en satelittkanal. I det etterfølgende er det av illustrative hensyn henvist til en satellittforbindelse eller kanal. Med satellittforbindelse menes et helt satellittsystem som omfatter multipleksere (MUX), antenner og satellitt. This invention relates to a method for reducing time delay in a telephone system. More specifically, it concerns a method for reducing the audible time delay that occurs when the signals are sent, for example, via a satellite channel. In what follows, for illustrative purposes, reference is made to a satellite connection or channel. By satellite connection is meant an entire satellite system that includes multiplexers (MUX), antennas and satellite.

I det etterfølgende er det av illustrative hensyn vist til et GSM-system (GSM - Global System for Mobile Communication) hvor det anvendes et såkalt A-grensesnitt mellom et basestasjonssystem BSS (Base Station System) og en mobiltelefonsen--tral MSC (Mobile Service Switching Centre). Ved tradisjonell mobiltelefoni koples alle samtaler i mobiltelefonsentralen In what follows, for illustrative purposes, a GSM system (GSM - Global System for Mobile Communication) is shown where a so-called A interface is used between a base station system BSS (Base Station System) and a mobile phone exchange MSC (Mobile Service Switching Centre). With traditional mobile telephony, all calls are connected in the mobile phone exchange

MSC. MSc.

Normalt er en slik løsning akseptabel, men når basestasjonssystemet og mobiltelefonsentralen kommuniserer for eksempel via en satellittforbindelse oppstår det en hørbar tidsforsinkelse i størrelsesorden 0,5 sekunder. Normally, such a solution is acceptable, but when the base station system and the mobile phone exchange communicate, for example, via a satellite connection, an audible time delay of the order of 0.5 seconds occurs.

Dette er typisk et problem når basestasjonssystemet befinner seg på et skip og mobiltelefonsentralen er plassert på land. This is typically a problem when the base station system is located on a ship and the mobile phone exchange is located on land.

Tidsforsinkelsen fordobles når begge samtalepartnere befinner seg på samme side av satelittforbindelsen, idet signalene først må sendes via satelittforbindelsen til mobiltelefonsentralen og deretter returneres til basestasjonssystemet via den samme satellittforbindelse. The time delay doubles when both interlocutors are on the same side of the satellite connection, as the signals must first be sent via the satellite connection to the mobile phone exchange and then returned to the base station system via the same satellite connection.

Oppfinnelsen har til formål å avhjelpe ulempene ved kjent teknikk. The purpose of the invention is to remedy the disadvantages of known technology.

Formålet oppnås i henhold til oppfinnelsen ved de trekk som er angitt i nedenstående beskrivelse og i de etterfølgende patentkrav. The purpose is achieved according to the invention by the features indicated in the description below and in the subsequent patent claims.

Ifølge en standardisert protokoll for telefonsystem av denne art er signalering og tale atskilt i to separate kanaler, en signaleringskanal og en talekanal. Det er således mulig å be-arbeide data som sendes via talekanalen uten å forstyrre sig-naler ingskanalen . According to a standardized protocol for telephone systems of this kind, signaling and speech are separated into two separate channels, a signaling channel and a speech channel. It is thus possible to process data sent via the voice channel without disturbing the signaling channel.

Når to personer på samme side av en satellittforbindelse ringer til hverandre, kan samtalekanalene ved hjelp av en lokal omkopler koples sammen .mens signaleringskanalen overføres til mobiltelefonsentralen via satelittforbindelsen. Samtale-kanalen blir således ikke sendt via satelittforbindelsen og utsettes derved ikke for den nevnte tidsforsinkelse. When two people on the same side of a satellite connection call each other, the call channels can be connected using a local switch, while the signaling channel is transmitted to the mobile phone exchange via the satellite connection. The conversation channel is thus not sent via the satellite connection and is thereby not exposed to the aforementioned time delay.

Ved å overvåke og analysere datastrømmen i signaleringskanalen mellom basestasjonssystemet og mobiltelefonsentralen, kan data som indikerer at en samtale bør omkoples lokalt trekkes ut, hvoretter de respektive samtalekanalene sammenkoples lokalt. By monitoring and analyzing the data flow in the signaling channel between the base station system and the mobile phone exchange, data indicating that a call should be switched locally can be extracted, after which the respective call channels are connected locally.

Et ytterligere fordelaktig trekk ved oppfinnelsen er at nød-vendig overføringskapasitet i satelittforbindelsen reduseres. A further advantageous feature of the invention is that the necessary transmission capacity in the satellite connection is reduced.

Et A-grensesnitt (grensesnitt) for kommunikasjon mellom et basestasjonssystem og en mobiltelefonsentral omfatter et antall TDM (tidslukedelte) forbindelser. Ved å konsentrere samtaler som går via satelittforbindelsen til et lavere antall TDM-lenker ved basestasjonssysternet, for deretter å ekspande-re disse konsentrerte TDM-lenker til det opprinnelige antall ved mobiltelefonsentralen, kan overføringskapasitet i sate-littf orbindelsen spares. TDM-tidsluker som ikke sendes til mobiltelefonsentralen kan således benyttes for lokale samtaler. An A interface (interface) for communication between a base station system and a mobile telephone exchange comprises a number of TDM (time slot division) connections. By concentrating calls that go via the satellite connection to a lower number of TDM links at the base station system, and then expanding these concentrated TDM links to the original number at the mobile phone exchange, transmission capacity in the satellite-LTE connection can be saved. TDM time slots that are not sent to the mobile phone exchange can thus be used for local calls.

I et konvensjonelt mobiltelekommunikasjonssystem er kapasiteten bestemt av det totale antall TDM-tidsluker og lenker mellom basestasjonen og mobiltelefonsentralen. In a conventional mobile telecommunications system, the capacity is determined by the total number of TDM time slots and links between the base station and the mobile exchange.

I de tilfeller hvor samtlige TDM-tidsluker i den nevnte konsentrerte transmisjonsforbindelse er i bruk, vil det konven-sjonelle mobiltelekommunikasjonssystem, dersom det finnes le-dige TDM-tidsluker for lokale samtaler, forsøke å sette opp flere samtaler. Årsaken til dette er at en konvensjonell mo-biltelef onsentral ikke vil kunne ha en oversikt over hvilke samtaler som er lokale og hvilken som er langdistansesamta-ler, og mobiltelefonsentralen vil derved heller ikke kjenne kapasitetsituasjonen i transmisjonsforbindelsen. In cases where all TDM time slots in the aforementioned concentrated transmission connection are in use, the conventional mobile telecommunications system, if there are available TDM time slots for local calls, will attempt to set up more calls. The reason for this is that a conventional mobile phone switchboard will not be able to have an overview of which calls are local and which are long-distance calls, and the mobile phone switchboard will thereby also not know the capacity situation in the transmission connection.

Oppfinnelsen omfatter en fremgangsmåte for å forhindre at mo-biltelef onsentralen forsøker å sette opp ytterligere samtaler når transmisjonsforbindelsens kapasitet er fullt utnyttet. The invention includes a method to prevent the mobile telephone exchange from attempting to set up further calls when the capacity of the transmission connection is fully utilised.

I det etterfølgende beskrives et ikke-begrensende eksempel på en foretrukket fremgangsmåte som er anskueliggjort på medføl-gende tegninger, hvor: In what follows, a non-limiting example of a preferred method is described which is illustrated in the accompanying drawings, where:

Fig. 1 viser hovedkomponentene i et telefonsystem ifølge oppfinnelsen; Fig. 2 viser signalerings- og samtalekanalens transmisjonsvei ifølge kjent teknikk; og Fig. 3 viser signalerings- og samtalekanalens transmisjonsvei ifølge oppfinnelsen idet signaleringskanalens transmisjonsvei er vist stiplet. Fig. 1 shows the main components of a telephone system according to the invention; Fig. 2 shows the transmission path of the signaling and conversation channel according to known technology; and Fig. 3 shows the transmission path of the signaling and conversation channel according to the invention, as the transmission path of the signaling channel is shown dashed.

På tegningene betegner henvisningstallet 1 et basestasjonssystem (BSS) av i og for seg kjent art. Basestasjonssystemet 1 kommuniserer med en lokal omkopler 2 via et antall kanaler El-1 til El-n hvor n er et valgt tall. In the drawings, the reference number 1 denotes a base station system (BSS) of a known nature. The base station system 1 communicates with a local switch 2 via a number of channels El-1 to El-n where n is a selected number.

Den lokale omkopler 2 kommuniserer via et transmisjonssystem 3, her i form av et satellittsamband, med en fjern omkopler 4 via et antall kanaler El-1 til El-m hvor 1 og m er valgte tall. The local switch 2 communicates via a transmission system 3, here in the form of a satellite connection, with a remote switch 4 via a number of channels El-1 to El-m where 1 and m are selected numbers.

Den fjerne omkopler 4 kommuniserer via et antall kanaler El-1 til El-n med en mobiltelefonsentral (MSC) 5 av i og for seg kjent art. Kanalene El-1 til El-n mellom den fjerne omkopler 4 og mobiltelefonsentralen 5 tilsvarer kanalene El-1 til El-n mellom basestasjonssysternet 1 og den lokale omkopler 2. The remote switch 4 communicates via a number of channels El-1 to El-n with a mobile telephone exchange (MSC) 5 of a known nature. The channels El-1 to El-n between the remote switch 4 and the mobile telephone exchange 5 correspond to the channels El-1 to El-n between the base station system 1 and the local switch 2.

En TDM-tidslukeovervåker, dekoder og analysator 6, nedenfor betegnet TDM-analysator evt. analysator, er koplet til kanalene mellom basestasjonssystemet 1 og den lokale omkopler 2. I fig. 1 er dette illustrert ved at kanal El-1 er koplet til TDM-analysatoren 6. A TDM time slot monitor, decoder and analyzer 6, hereinafter referred to as TDM analyzer or analyzer, is connected to the channels between the base station system 1 and the local switch 2. In fig. 1, this is illustrated by the fact that channel El-1 is connected to the TDM analyzer 6.

TDM-analysatoren 6 kommuniserer med den lokale omkopler 2 og med den fjerne omkopler 4 og mobiltelefonsentralen 5 ved hjelp av en TCP/IP forbindelse/nettverk 7. The TDM analyzer 6 communicates with the local switch 2 and with the remote switch 4 and the mobile telephone exchange 5 by means of a TCP/IP connection/network 7.

TDM-analysatoren 6 bygger opp en lokal database med såkalte IMSI (International Mobile Subscriber Identity) og MS-ISDN (Mobile Station - Integrated Services Digital Network) nummer for hver mobiltelefon som er knyttet til basestasjonssysternet 1. The TDM analyzer 6 builds up a local database with so-called IMSI (International Mobile Subscriber Identity) and MS-ISDN (Mobile Station - Integrated Services Digital Network) numbers for each mobile phone that is connected to the base station system 1.

IMSI nummeret leses fra signaleringsmeldingen 'locati-on_updating_accept' mens MS-ISDN hentes fra mobiltelefonsentralen 5 ved å gjøre et oppslag med IMSI nummeret som refe-ranse . The IMSI number is read from the signaling message 'locati-on_updating_accept', while the MS-ISDN is retrieved from the mobile telephone exchange 5 by making a lookup using the IMSI number as a reference.

Deretter oppretter TDM-analysatoren 6 en midlertidig liste over alle abonnenter som forsøker å sette opp samtaler, heretter betegnet A-abonnenter 8, i mobiltelefonsentralen 5. The TDM analyzer 6 then creates a temporary list of all subscribers attempting to set up calls, hereinafter referred to as A subscribers 8, in the mobile telephone exchange 5.

Følgende A-grensesnittmeldinger overvåkes for å hente nødven-dig informasjon, idet informasjonsarten er angitt i parantes: The following A-interface messages are monitored to retrieve the necessary information, the type of information being indicated in parentheses:

4. Cm_service_request (A-IMSI). 4. Cm_service_request (A-IMSI).

5. Connection_confirmed (logisk signaleringslink Id). 5. Connection_confirmed (logical signaling link Id).

6. Setup (MS-ISDN for B-abonnent). 6. Setup (MS-ISDN for B subscriber).

7. Assignment_reguest (informasjon om hvilke tidsluke som brukes). 7. Assignment_reguest (information about which time slot is used).

Meldingene hentes fra protokollene SCCP (Signalling Connec-tion Control Part), DTAP (Direct Transfer Application Part), BSSMAP (Base Station System Management Application Part) i A-grensesnittet. The messages are obtained from the protocols SCCP (Signalling Connection Control Part), DTAP (Direct Transfer Application Part), BSSMAP (Base Station System Management Application Part) in the A interface.

Det lagres en midlertidig liste i TDM-analysatoren 6 over alle mobilabonnenter som til enhver tid blir forsøkt oppringt, og disse abonnenter betegnes heretter B-abonnenter 9 i mobiltelefonsentralen 5. A temporary list is stored in the TDM analyzer 6 of all mobile subscribers who are attempted to be called at any time, and these subscribers are hereinafter referred to as B subscribers 9 in the mobile telephone exchange 5.

Følgende A-grensesnittmeldinger overvåkes for å hente nødven-dig informasjon, idet informasjonsarten er angitt i parantes: The following A-interface messages are monitored to retrieve the necessary information, the type of information being indicated in parentheses:

8. Paging_response (B-IMSI). 8. Paging_response (B-IMSI).

9. Connection_confirmed {logisk signaleringslink Id). 9. Connection_confirmed {logical signaling link Id).

10. Assignment_request (informasjon om hvilke tidsluke som brukes). 11. Connect_acknowledge (anvendes som konsentreringstidspunkt for eksterne samtaler). 10. Assignment_request (information about which time slot is used). 11. Connect_acknowledge (used as concentration time for external calls).

Når A-abonnenten mottar A-grensesnittmeldingen 'connect_ack' vil TDM-analysatoren 6 gjøre et oppslag av B-MS-ISDN nummeret i den ovenfor nevnte abonnentdatabase og deretter undersøke om det resulterende B-IMSI nummeret finnes i listen over B-abonnenter som blir forsøkt oppringt. Dersom nummeret finnes, krysskoples de korresponderende TDM-tidsluker i den lokale omkopler 2. When the A subscriber receives the A interface message 'connect_ack', the TDM analyzer 6 will look up the B-MS-ISDN number in the above-mentioned subscriber database and then check whether the resulting B-IMSI number is present in the list of B subscribers that are attempted call. If the number is found, the corresponding TDM time slots are cross-connected in the local switch 2.

Dersom samtaler ikke skal krysskoples lokalt, for eksempel når A- og B-abonnentene 8, 9 befinner seg i forskjellige basestasjonssystem 1, anvendes innhentet TDM-tidslenke-informasjon til å igangsette ønsket konsentrasjon av TDM-tidslenkene. If calls are not to be cross-connected locally, for example when the A and B subscribers 8, 9 are located in different base station systems 1, the obtained TDM time link information is used to initiate the desired concentration of the TDM time links.

All sammenkopling av samtaler og konsentrasjon av TDM-tidslenker styres av TDM-analysatoren 6. TDM-tidsluke-informasjon for den aktuelle samtale anvendes for å igangsette omkopling av TDM-tidsluker mellom TDM-tidslenkene på base-stas jonssystem- 1 og mobiltelefonsentral- siden 5 av den lokale omkopler 2, henholdsvis den fjerne omkopler 4 og TDM-lenkene som sendes via satelittforbindelsen 3. All connection of calls and concentration of TDM time links is controlled by the TDM analyzer 6. TDM time slot information for the call in question is used to initiate switching of TDM time slots between the TDM time links on the base station system 1 and mobile telephone exchange side 5 of the local switch 2, respectively the remote switch 4 and the TDM links sent via the satellite connection 3.

I fig. 1 er det vist et eksempel hvor fire TDM-lenker konsentreres til to TDM-lenker. Andre konstellasjoner er selv-følgelig mulig. In fig. 1 shows an example where four TDM links are concentrated into two TDM links. Other constellations are of course possible.

TDM-analysatoren 6 lager og vedlikeholder en liste over alle samtaler som til enhver tid er omkoplet i den lokale omkopler 2 og den fjerne omkopler 4. Når en samtale blir avsluttet, det vil si at A-grensesnittmeldingen 'released' for en aktiv oppkalling avleses i signaleringskanalen, vil TDM-analysatoren 6 gi melding til den lokale omkopler 2 og den fjerne omkopler 4 om at koplingene for den aktuelle samtale-skal brytes. The TDM analyzer 6 creates and maintains a list of all calls that are switched at any given time in the local switch 2 and the remote switch 4. When a call is terminated, that is, the A interface message 'released' for an active call is read in the signaling channel, the TDM analyzer 6 will notify the local switch 2 and the remote switch 4 that the connections for the call in question are to be broken.

Formidling av informasjon mellom TDM-analysatoren 6 og den lokale omkopler 2 foregår ved hjelp av et vanlig TCP/IP-nettverk. Den fjerne omkopler 4 mottar på samme måte informasjon fra TDM-analysatoren 6 for å kunne trekke ut TDM-lenkene fra satelittforbindelsen 3 og til systemets totale antall TDM-lenker på riktig måte. Communication of information between the TDM analyzer 6 and the local switch 2 takes place using a standard TCP/IP network. The remote switch 4 similarly receives information from the TDM analyzer 6 to be able to correctly extract the TDM links from the satellite connection 3 and to the system's total number of TDM links.

TDM-analysatoren 6 er innrettet til å kunne holde en oversikt over kapasitetstatusen på satelittforbindelsen 3 og å forhindre at det settes opp ytterligere samtaler i mobiltelefon-stasjonen 5 når all tilgjengelig transmisjonskapasitet er i bruk. Dette gjøres ved hjelp av TCP/IP nettverket 7. The TDM analyzer 6 is designed to be able to keep an overview of the capacity status of the satellite connection 3 and to prevent further calls being set up in the mobile phone station 5 when all available transmission capacity is in use. This is done using the TCP/IP network 7.

Claims (4)

1. Fremgangsmåte for å kople om en talekanal i et mobil telefonsystem som omfatter et grensesnitt mellom et basestasjonssystem (1) som kommuniserer med en mobiltelefonsentral (5) via en transmisjonsforbindelse (3), karakterisert ved at talekanalene til en oppringende abonnent (8) og en oppringt abonnent (9), som begge befinner seg på basestasjonsystemets (1) side av transmisjonsforbindelsen (3), sammenkoples i en lokal omkopler (2) .1. Method for switching a voice channel in a mobile telephone system comprising an interface between a base station system (1) which communicates with a mobile telephone exchange (5) via a transmission connection (3), characterized in that the voice channels of a calling subscriber (8) and a called subscriber (9), both of which are located on the base station system (1) side of the transmission connection (3), are connected in a local switch (2). 2. Fremgangsmåte i henhold til krav 1, karakterisert ved at en signaleringskanal korresponderende til ett sett talekanaler overvåkes ved hjelp av en analysator (6), idet informasjon om den oppringte abonnent (9) analyseres for deretter å kople sammen samtalene i den lokale omkopler dersom begge abonnenter (8, 9) befinner seg på samme side av transmisjonsforbindelsen (3).2. Method according to claim 1, characterized in that a signaling channel corresponding to one set of voice channels is monitored using an analyzer (6), with information about the called subscriber (9) being analyzed in order to then connect the calls in the local switch if both subscribers (8, 9) are on the same side of the transmission connection (3). 3. Fremgangsmåte i henhold til krav 1 og 2, karakterisert ved at et antall transmisjonslenker fra basestasjonssystemet (1) konsentreres til et mindre antall transmisjonslenker som overføres via transmisjonsforbindelsen (3), hvoretter det mindre antall transmisjonslenker ekspanderes til det opprinnelige antall transmisjonslenker før de sendes til mobiltelefonsentralen (5).3. Method according to claims 1 and 2, characterized in that a number of transmission links from the base station system (1) is concentrated into a smaller number of transmission links that are transmitted via the transmission connection (3), after which the smaller number of transmission links is expanded to the original number of transmission links before they are sent to the mobile phone exchange (5). 4. Fremgangsmåte i henhold til krav 1 til 3, karakterisert ved at analysatoren (6) overvåker kapasi-tetsutnyttelsen i transmisjonsforbindelsen (3) og hindrer mobiltelefonsentralen (5) fra å prøve å sette opp ytterligere samtaler dersom kapasiteten er fullt utnyttet.4. Method according to claims 1 to 3, characterized in that the analyzer (6) monitors the capacity utilization in the transmission connection (3) and prevents the mobile telephone exchange (5) from trying to set up further calls if the capacity is fully utilised.
NO20034333A 2003-09-29 2003-09-29 Procedure for Reducing Time Delay in a Telephone System NO319965B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NO20034333A NO319965B1 (en) 2003-09-29 2003-09-29 Procedure for Reducing Time Delay in a Telephone System
EP04775071A EP1668795A1 (en) 2003-09-29 2004-09-29 Method for reducing the time delay in a telephone system
PCT/NO2004/000288 WO2005032002A1 (en) 2003-09-29 2004-09-29 Method for reducing the time delay in a telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO20034333A NO319965B1 (en) 2003-09-29 2003-09-29 Procedure for Reducing Time Delay in a Telephone System

Publications (3)

Publication Number Publication Date
NO20034333D0 NO20034333D0 (en) 2003-09-29
NO20034333L NO20034333L (en) 2005-03-30
NO319965B1 true NO319965B1 (en) 2005-10-03

Family

ID=29417557

Family Applications (1)

Application Number Title Priority Date Filing Date
NO20034333A NO319965B1 (en) 2003-09-29 2003-09-29 Procedure for Reducing Time Delay in a Telephone System

Country Status (3)

Country Link
EP (1) EP1668795A1 (en)
NO (1) NO319965B1 (en)
WO (1) WO2005032002A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101998666B (en) * 2009-08-12 2014-09-10 中兴通讯股份有限公司 Method for realizing local call and local exchange

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6169892B1 (en) * 1997-11-22 2001-01-02 Northern Telecom Limited Flow control of authentication triplet request for reducing usage time of a central processor
US6141531A (en) * 1997-11-26 2000-10-31 Direct Wireless Corporation Local wireless communication system with external communications link
GB2334179A (en) * 1998-02-04 1999-08-11 Motorola Ltd Local Call Routing in a Mobile communications System
US6138014A (en) * 1998-02-27 2000-10-24 Ericsson Inc. System and method for optimization of multi-party calls in a satellite network
AUPR910301A0 (en) * 2001-11-26 2001-12-20 Marine-Watch Limited Satellite system for vessel identification
JP3789354B2 (en) * 2001-12-26 2006-06-21 日本電気通信システム株式会社 Base station controller load balancing method

Also Published As

Publication number Publication date
EP1668795A1 (en) 2006-06-14
WO2005032002A1 (en) 2005-04-07
NO20034333D0 (en) 2003-09-29
NO20034333L (en) 2005-03-30

Similar Documents

Publication Publication Date Title
JP4790690B2 (en) Method and apparatus for processing telephone calls directed to mobile phones that are incapable of communication
US7577090B2 (en) Method and system for providing availability and reliability for a telecommunication network entity
US8369825B2 (en) Enhanced E911 network access for a call center using session initiation protocol (SIP) messaging
US5797093A (en) Routing of an emergency cellular telephone call
FI106423B (en) Arrangements for detecting fraudulently identified mobile telephones in a cellular mobile telecommunications network
AU2005200060B2 (en) Managing routing path of voice over internet protocol (VoIP) system
US9161185B2 (en) Computer readable medium and system for voicemail service mobility
US8265077B2 (en) Lawful interception method and architecture for transparent transmission of interception information
WO2007050207A2 (en) Peering network for parameter-based routing of special number calls
US6078654A (en) Method of and system for efficient use of telecommunication networks
US7471673B2 (en) IP telephone system having a hold function and a callback function
US6324384B1 (en) Call processing method, subscriber unit, and access control apparatus operated in wireless local loop system
CN100459738C (en) Realization method for controlling and bearing dual homing in separate network
EP0969689A1 (en) Switching internet traffic through digital switches having a time slot interchange network
EP0969689A2 (en) Switching internet traffic through digital switches having a time slot interchange network
NO319965B1 (en) Procedure for Reducing Time Delay in a Telephone System
CN100499696C (en) Method for solving interior and exterior simultaneous robbing under signaling and service separate structure
KR100318965B1 (en) System and method for supervising and wiretapping of subscriber in exchange system
JP2001217928A (en) Enhanced system and method used in telephone network to promote distribution of emergency call to public safety answering point(psap)
US6978133B2 (en) Mobile station origination when serving mobile switching center is not wireless intelligent network capable
US7130407B1 (en) Method for processing call establishment requests
KR100662188B1 (en) Soft interconnection gateway system for operating as gateway system and method thereof
KR20010039059A (en) Method for managing resource release using FR and PRI call process ID
KR20000024743A (en) Method for matching messages between call processing block and v5.2 block in control station of wll system
WO2006056230A1 (en) Completing a call in a radio telecommunications system when a radio communication channel becomes available

Legal Events

Date Code Title Description
MM1K Lapsed by not paying the annual fees