WO2007103620A2 - Procede d'acheminement d'appels dans un reseau de communication mobile - Google Patents

Procede d'acheminement d'appels dans un reseau de communication mobile Download PDF

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Publication number
WO2007103620A2
WO2007103620A2 PCT/US2007/062211 US2007062211W WO2007103620A2 WO 2007103620 A2 WO2007103620 A2 WO 2007103620A2 US 2007062211 W US2007062211 W US 2007062211W WO 2007103620 A2 WO2007103620 A2 WO 2007103620A2
Authority
WO
WIPO (PCT)
Prior art keywords
msc
hlr
request
roaming number
mobile
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US2007/062211
Other languages
English (en)
Other versions
WO2007103620A3 (fr
Inventor
Jian-Hua Hou
Yun-Shan Ge
Chao Jiang
Hong Wang
Ying-Xin Zhou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Publication of WO2007103620A2 publication Critical patent/WO2007103620A2/fr
Anticipated expiration legal-status Critical
Publication of WO2007103620A3 publication Critical patent/WO2007103620A3/fr
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/06—Registration at serving network Location Register, VLR or user mobility server
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • the present invention relates generally to routing telephone calls to mobile devices.
  • the invention relates to routing calls in a Global System for Mobile Communications (GSM) network through a Mobile Switching Center (MSC) using a Home Location Register (HLR).
  • GSM Global System for Mobile Communications
  • MSC Mobile Switching Center
  • HLR Home Location Register
  • Telephone calls placed to mobile phones may not go through due to a variety of reasons.
  • a called mobile phone may be busy, turned off, out of range of a wireless network, or may be otherwise non-reachable. Tn such situations, callers often place repetitive additional calls to the called mobile phone until a call goes through and the called mobile phone is answered. Placing such repetitive additional calls is inconvenient and problematic as it wastes the time of callers, who must continual re- key a phone dialing sequence, and because it wastes wireless network resources that must repetitively route and process the additional voice calls (which generally receive high network priority) until a called phone is answered.
  • HLRs Home Location Registers
  • RAN Radio Access Network CE15534CM
  • MSC mobile subscriber control
  • the MSC identifies the phone and informs an HLR associated with the phone that the phone is now currently in wireless communication with the MSC. If an incoming call directed to the phone is then received in the network, the network first contacts the HLR associated with the phone to learn the identity of the MSC that is currently managing wireless communication with the phone. The incoming call is then routed through the MSC to the phone.
  • technical problems sometimes arise with MSCs, which are then rendered temporarily out of service. When technical problems with an MSC arise suddenly, or are transient and reoccurring, calls to mobile phones associated with the out of service MSC will not go through. That is because an HLR generally designates only a single MSC with a particular mobile phone. Thus when an MSC is suddenly rendered out of service, all incoming calls that would normally be routed through the MSC to phones associated with the MSC do not go through.
  • the present invention is a method for routing calls in a mobile communication network.
  • the method includes processing at a Home Location Register (HLR) a call setup message for a call to a Mobile Station (MS).
  • HLR Home Location Register
  • MS Mobile Station
  • a first request for a roaming number associated with the MS is transmitted from the HLR to a first Mobile Switching Center (MSC).
  • MSC Mobile Switching Center
  • a second request for a roaming number associated with the MS is transmitted from the HLR to a second MSC.
  • CE15534CM Embodiments of the present invention therefore enable reducing a frequency of failed calls in a mobile communication network.
  • an HLR that manages the called mobile station is not limited to transmitting requests for roaming numbers for the mobile station to only a single MSC to which the mobile station was last registered. Rather, the HLR can iteratively contact each MSC from a plurality of MSCs operating in the pool area, until one of the MSCs is able to provide a roaming number for a particular called mobile station.
  • FIG. 1 is a schematic diagram illustrating components of a typical Global System for Mobile Communications (GSM) voice data communications network that connects a calling station to a mobile station (MS);
  • FIG. 2 is a schematic diagram illustrating components of a conventional GSM system that includes a pool area;
  • FIG. 3 is a message sequence chart illustrating a method for routing calls in a mobile communication network, according to an embodiment of the present invention.
  • FIG. 4 is a general flow diagram illustrating a method for routing calls in a mobile communication network, according to an embodiment of the present invention.
  • a schematic diagram illustrates components of a typical Global System for Mobile Communications (GSM) voice data communications network 100 that connects a calling station 105 to a mobile station (MS) 110.
  • the calling station 105 can be any type of station, such as a mobile phone or a wireline terminal, capable of connecting to a Public Land Mobile Network (PLMN) 115 in which the MS 110 operates.
  • PLMN Public Land Mobile Network
  • the calling station 105 To initiate a call from the calling station 105 to the mobile station 110, the calling station 105 first sends an incoming call setup signal, such as an Initial Address Message (IAM), to a Gateway Mobile Switching Center (GMSC) 120 associated with the PLMN 115. If the calling station 105 is another mobile device, the IAM is routed to the GMSC 120 through another PLMN. If the calling station 105 is a wireline terminal, then the IAM is routed to the GMSC 120 through a local exchange. CE15534CM After receiving the incoming call setup signal, the GMSC 120 transmits a IAM, to GMSC 120 through a local exchange.
  • IAM Initial Address Message
  • GMSC 120 Gateway Mobile Switching Center
  • MAP Mobile Application Part
  • HLR Home Location Register
  • MSISDN Mobile Subscriber Integrated Service Digital Network
  • MSC/VLR Visitor Location Register
  • the MSISDN of the called mobile station 110 to access information about the current location of the mobile station 110, and to identify the MSC 130 that is currently serving the mobile station 110.
  • the HLR 125 transmits a message to the MSC 130, such as a MAPJPRO VIDE RO AMING JSfUMBER message, requesting a roaming number associated with the mobile station 110.
  • the MSC 130 responds by sending a MAP message back to the HLR 125, including a roaming number of the MSC 130, and the HLR 125 then forwards the roaming number to the GMSC 120.
  • the GMSC 120 is then able to establish a call connection from the calling station 105, to the GMSC 120, and then directly to the MSC 130.
  • the MSC 130 pages the mobile station 110 and assigns radio channels so that the call can go through between the calling station 105 and the mobile station 110.
  • a schematic diagram illustrates components of a conventional GSM system 200 that includes a pool area 205.
  • a pool area is an area within which a mobile station can roam without needing to change its serving Core Network (CN) node, such as an MSC.
  • CN Core Network
  • the pool area 205 is served by one or more CN nodes, such as the first MSC
  • a Radio Access Network (RAN) node 220 can comprise for example a Radio Network Controller (RNC) or a Base Station Controller (BSC).
  • RNC Radio Network Controller
  • BSC Base Station Controller
  • a message sequence chart 300 illustrates a method for routing calls in a mobile communication network, according to an embodiment of the present invention.
  • a call setup message such as a CE15534CM MAP_SEND_ROUTING_INFORMATION message is transmitted from a Gateway
  • GMSC Mobile Switching Center
  • HLR Home Location Register
  • MSC Mobile Switching Center
  • the first request for a roaming number can be a MAP_PROVIDE JR-OAMINGJS[UMBER message
  • the first MSC 325 is generally the MSC to which the mobile station was last registered.
  • the first MSC 325 is out of service, or is otherwise unable to process the request from the HLR 315, no response to the first request for a roaming number will be received at the HLR 315.
  • the first MSC 325 operates in a pool area, other MSCs also will be within range of a RAN node that serves the mobile station to which the GMSC 310 is attempting to place a call.
  • the HLR 315 maintains a listing that identifies alternative MSCs that are also operating within the same pool area as the first MSC 325. Therefore, when no response to the first request for a roaming number is received, the HLR 315 selects from its listing a second MSC 330 in the pool area covering the called mobile station. At line 335, the HLR 315 transmits to the second MSC 330 a second request for a roaming number associated with the called mobile station. If the second MSC 330 is not out of service, it will receive and process the second request for a roaming number.
  • the second MSC 330 will not be able to immediately provide a roaming number associated with the called mobile station.
  • the second MSC 330 therefore transmits to the HLR 315 a CE15534CM request, such as a MAP_RESTORE_DATA message, for additional subscriber data concerning the called mobile station.
  • the HLR 315 then transmits back to the second MSC 330 additional subscriber data, such as an International Mobile Subscriber Identity (IMSI) record, associated with the called mobile station.
  • IMSI International Mobile Subscriber Identity
  • the second MSC 330 transmits to the HLR 315 a roaming number associated with the called mobile station.
  • the HLR 315 is then able to respond to the call setup message from the GMSC 310, and a call can be established through the GMSC 310 and the second MSC 330 to the called mobile station.
  • the HLR 315 could simply select a third MSC (not shown) that is also in the pool area that covers the called mobile station.
  • the HLR 315 is able to itcrativcly step through a process of transmitting a plurality of requests for roaming numbers to a plurality of MSCs in a given pool area, until one of the MSCs provides an appropriate roaming number to the HLR 315.
  • a general flow diagram illustrates a method 400 for routing calls in a mobile communication network, according to an embodiment of the present invention.
  • the HLR 315 processes a call setup message received from the GMSC 310 for a call to a mobile station (MS).
  • the HLR 315 transmits, to the first MSC 325, a first request for a roaming number associated with the called MS.
  • the method 400 continues at step 425 where a second request for a roaming number is transmitted from the HLR 315 to the second MSC 330.
  • the HLR 315 receives and processes a request for additional subscriber data from the second MSC 330.
  • additional subscriber data such as an IMSI record associated with the called MS, is transmitted to the second MSC 330.
  • a roaming number received from the second MSC 330, is processed at the HLR 315. The call to the MS therefore can be completed, and the method 400 then ends.
  • a Home Location Register that manages the called mobile station is not limited to transmitting requests for roaming numbers for the called mobile station to only a single MSC to which the mobile station was last registered. Rather, the HLR can itcrativcly contact each MSC from a plurality of MSCs operating in the pool area, until one of the MSCs is able to provide a roaming number for a particular called mobile station.
  • QoS Quality of Service
  • the non-processor circuits may include, but are not limited to, a radio receiver, a radio transmitter, signal drivers, clock circuits, power source circuits, and user input devices. As such, these functions may be interpreted as steps of a method for routing calls in a mobile communication network. Alternatively, some or all functions could be implemented by a state machine that has no stored program instructions, or in one or more application specific integrated circuits (ASICs), in which each function or some combinations of certain of the functions are implemented as custom logic. Of course, a combination of the two approaches could be used. Thus, methods and means for these functions have been described herein.

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

Abstract

La présente invention concerne un procédé d'acheminement d'appels dans un réseau de communication mobile qui est utile pour diminuer la fréquence d'appels manqués. Le procédé comprend le traitement à un registre d'emplacements d'origine (HLR) (315) d'un message de configuration d'appel pour un appel à une station mobile (MS). En réponse au message de configuration d'appel, une première requête de numéro itinérant associé à la MS est transmise à partir du HLR (315) à un premier centre de commutation mobile (MSC) (325). Après la non-réception à partir du premier MSC (325) d'un numéro itinérant associé à la MS en réponse à la première requête, une seconde requête de numéro itinérant associé à la MS est transmise à partir du HRL (315) à un second MSC (330).
PCT/US2007/062211 2006-03-07 2007-02-15 Procede d'acheminement d'appels dans un reseau de communication mobile Ceased WO2007103620A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNA2006100597713A CN101035361A (zh) 2006-03-07 2006-03-07 在移动通信网络中路由呼叫的方法
CN200610059771.3 2006-03-07

Publications (2)

Publication Number Publication Date
WO2007103620A2 true WO2007103620A2 (fr) 2007-09-13
WO2007103620A3 WO2007103620A3 (fr) 2009-04-23

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PCT/US2007/062211 Ceased WO2007103620A2 (fr) 2006-03-07 2007-02-15 Procede d'acheminement d'appels dans un reseau de communication mobile

Country Status (2)

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CN (1) CN101035361A (fr)
WO (1) WO2007103620A2 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2891350A4 (fr) * 2012-08-29 2016-04-13 Hewlett Packard Development Co Acheminement d'appel par commutation de circuits

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5884180A (en) * 1996-10-30 1999-03-16 Telefonaktiebolaget Lm Ericsson (Publ) Method of providing a delayed connection announcement to a mobile subscriber within a radio telecommunication system
US7606190B2 (en) * 2002-10-18 2009-10-20 Kineto Wireless, Inc. Apparatus and messages for interworking between unlicensed access network and GPRS network for data services
FI20040841A0 (fi) * 2004-06-17 2004-06-17 Nokia Corp Menetelmä tietoliikenteen valvomiseksi käyttäen verkkonoodiryhmää kommunikaatiojärjestelmässä

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CN101035361A (zh) 2007-09-12
WO2007103620A3 (fr) 2009-04-23

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