CA2338512A1 - Enhanced call delivery system - Google Patents

Enhanced call delivery system Download PDF

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Publication number
CA2338512A1
CA2338512A1 CA002338512A CA2338512A CA2338512A1 CA 2338512 A1 CA2338512 A1 CA 2338512A1 CA 002338512 A CA002338512 A CA 002338512A CA 2338512 A CA2338512 A CA 2338512A CA 2338512 A1 CA2338512 A1 CA 2338512A1
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CA
Canada
Prior art keywords
location
switched network
packet
circuit
mobile terminal
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.)
Abandoned
Application number
CA002338512A
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French (fr)
Inventor
Andrew Silver
Gary B. Stephens
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.)
Nortel Networks Ltd
Original Assignee
Nortel Networks Limited
Andrew Silver
Gary B. Stephens
Nortel Networks Corporation
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Publication date
Application filed by Nortel Networks Limited, Andrew Silver, Gary B. Stephens, Nortel Networks Corporation filed Critical Nortel Networks Limited
Publication of CA2338512A1 publication Critical patent/CA2338512A1/en
Abandoned legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/02Processing 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
    • H04W8/08Mobility data transfer
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W68/00User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/02Processing 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
    • H04W8/04Registration at HLR or HSS [Home Subscriber Server]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/02Processing 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
    • H04W8/06Registration at serving network Location Register, VLR or user mobility server
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16Gateway arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W92/00Interfaces specially adapted for wireless communication networks
    • H04W92/02Inter-networking arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W92/00Interfaces specially adapted for wireless communication networks
    • H04W92/16Interfaces between hierarchically similar devices
    • H04W92/24Interfaces between hierarchically similar devices between backbone network devices

Abstract

The invention expedites the delivery of a call originating in a circuit-switched network to a mobile terminal camped on a packet-switched network.
Information representing the location of the mobile terminal in the packet-switched network is provided to the circuit switched network. A call setup with the mobile terminal is initiated with reference to the previously received location information, frequently more expeditiously and using less resources. Location-based services are also provided by the circuit-switched network with access to such mobile terminal location information.

Description

ENHANCED CALL DELIVERY SYSTEM
This application claims priority from United State~~ provisional application Serial No. 60/094,035 filed July 24, L'a98.
_'i TECHNICAL FIELD OF THE INVENTION
This invention relates to delivery of telecc>mmunicati.on~ services and, more particularly, to sharing of information representing the geographic location of a me>bile terminal by two networks serving the terminal in substantially the same geographic area.

CONFIRMATIGN COPY

A recent development in the fielc of wireless telecommuni.cat:ions is the capability of transmitting.
data through p:3c~:et-switched networks. Perhaps the most well-known packet-switched network is the "Internet" world-wide computer network, which is, also often referred to as the "World-Wide Web." Another famili<~r packet_:-switched network is a "Local Area Network" or 'LAN" which is used principally to interconnect personal and other computers within an office or other enrerprise.
Packet,-switched networks are typically charac~erized by t:he transmission of data in a string of separate "pa.caets" or "frames," each of which may be directed through different paths through the packet-switched network to the same ultimate destination. Upon receipt at the destination, the packets of inforrn,~tion are assembled and used in the correct, o.rig.inal order, as if the entire string had arrived in that order, following the same physical path.
Due to i:h~~ fl.exibility, capabilities and speed associated, network systems, standards and transmission protocols are being developed to transmit data and voice to a single wireless terminal. Such terminals include mobile telephones, personal computers (such as Laptops) and the like through which a user may d.=~si.:re to send both voice and data communications . Perhaps the most common example of such activitie~~ is use of a mobile phone to make telephone calls and also to send and receive e-mail messages and access web pages on the Internet. Use of wireless terminal.:> for this dual purpose is expected to increase as t=elephone, fax and data transmission
-2-services cont:irrue to converge . Eventually, i .-_ is expected that mobile telephones and personal comt~uters will utilize wireless technology to allow both rnobile telephone calls and access to packet-switched networks without the need for lancx line connections. Gther applications will be apparent, as well, to one of ordinary skill in the art and may be developed in the future.
Existing wireless systems providing voice arid SMS
services utilize "circui.t-switched" networks to direct their transmissions. As currently envis:ioned, wireless data t:r,~ris,mission services will be del-ivered through a "packet:-switched" network that is physically separate from wireless networks presently providing circuit voice, l.irlited circuit data and limited Short Message Service (SMS) services. Circuit-switched systems differ fundamentally from packet-sw=itched systems in that a_ll information comprising the call or SMS follows tl2e same fix:ed-sized path within the network and, t:~erefore, cannot provide the same capacity and performance for transmission of data at acceptable costs. Consequently, physically separate packet-switched Networks will be constructed to provide wireless data transmissions service;, in addition to the existing and developing circuit-switched systems offering voice and SMS transmission services. A network protocol used by packet-switched and circuit-switched networks to communicate with each other is ANSI-41.
As envisioned, a mobile terminal will communicate with the packet-switched network in the transmission of data. When a telephone call, for example, is made
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NoRTH1282002 reguiring transmission of voice information, the mobile teznunal will communicate with the circuit-switched network. Examples of circuit-switched networks in existence and under development are AMPS, TDMA, GMS, S CDMA, and CD~'~A 200D_ Pxamples of a numbex of available packet-switched networks providing wireless data transmission services include GPRS (General Packet Radio Service) data networks. also identified as GPRS-136, and EDGE (Enhanced Datarate Global Evolution), also IO identified as GPRS-:_36HS.
U. S. Patent No. ~, 594, 133 describes apparatus and mobile stations that provide packet data services in Time L>ivision Multiple Access cellular systems, based on providing shared packet data I5 channels optimized for packet data. Described is a system that utilizes current cellular infrastructure to the extent possible consistent with functional and performance requirements. Shared packet daua charuZels and base stations may be provided and 20 dynamically determined by demand. A p«cket data controller in each Mobile Services Switching Center controls access to the packet data services. A
packet data router in each MSC routes packets to and from the MSC service area. A backbone network 25 intercon.nerts packet data routers and Enter Working In Functions providing Internet werking with external networks.
However, certain ~.nefficiencies are inherent ~.n using both circuit-switched and packet-switched systems ?0 to provide wireless voice and data transrn~.ssian services_ In particular, as currently envisioned, a anobile terminal ~ely~ng on both networks for voice and data sere iczs will .Acamp on@ or remain in couu~unicat.ion ....
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with the packat-switched network, such as GPRS-136, when in the idle state. While this appxoach tends to preserve resources of both systems by reducing the amount of air tr.me ar_d control rlessaging that would otherwise be reguired if the mobile terminal camped on the system trans:n.itting teleghcne calls and S1~S
messages, doing sa creates a delay (typicall.y 3 to 5 seconds per call) im connecting or cornpletir~q setup of incoming calls to the mobile terminal.
Because the mobile texminal w~.ll be camped on the network providing dat=a trar_smissiQn services at the t.ix~e of an incom3.ng telephone call or SMS message, the page message typically used to alert the mobile texzninal to the cGl~. aid reguest: a response is directed through the data transmission. network. This -~a-...~:t'.l~t~.~.: .:~.~'...:._ .. :,.,':.:..:.:.. :: ..;
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:~C7~tTh1282002 is considered preferable because information representing the location cf the mobile terminal is also highly likely to be~ known by the aata network on which the mobilE terminal is camped. Such location information is used to route the gage request to the packet switch curxe:ntl.y servicing the mobile terminal.
Although forwaxding~ the page request through the data network avoids unnecessary use of transmission resources of the circuit-swi.t.ched voice network that would otherwise be required to transmit a global page to all locations within the network or direct a page to an area in which the mob:~.le terminal is not found. additional delay in both sending the page and receiving a response from the mobile terminal ~.s occas=oned_ It will be apparer_t that such delay undesirably consumes additional resources of the vo:~ce network while awaiting a response from the mobile terminal and reduces the grade of service to Lhe calling party and the mobile terminal user as they await setup of the call.

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L~4RTHI282002 St7MMARY OF T!iR INVE~TTIO~T
These and other disadvantages are overcome by the method of the present =nvention, which expedites the delivery of a call originating in a circuit-switched S network to a mobile tex~i.nal camped an a packet-switched network. Infox~aation representing the Zocation of the mobile te=mi.nal in the packet-switched network is provided to the circuit switched network. A ca~.l setup with the mobile terminal is initiated with r eferer:ce to the previously received location information, frequently more expeditiously and using Iess resources.
In another aspect of the inventior_, call setup is initiated by the czxcuit-switched network with reference to the mobile terminal location information provided by ~.5 the packet-switched network, independently of a page response of the mobile terminal.
In yet another aspect of the invention, information representing the location of the mobile terminal within the packe:,-switched network is mapped to the l.acation of one or more transceiver locations in the circuit-switched network.
In still another aspect of the invention, call setup between the mobile terminal and the circuit-switched network is triggered with reference to one car . more page reguests tunneled through the packet-snitched network to the mobile terminal.
In yet another aspect of the invention, information representing the location of a mobile terminal within the packet-switched ::etwork is periodically provided to 'the circuit-switched network.

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In still another aspect of the invention, location-based telecommunication features or services are provided via a circuit-switched network with reference to in~ormation representing the location of the mobile terminal within a packet-switched network.
Other asz:>ects and features of the present invention will become apparent to those ordinarily skilled in the art upon review of the following description of specific embodiments of the invention in conjunction with the accompanying figures.

BRIEF DESCRIPTION OF THE DRAWINGS
For a morr:e complete understanding of the present invention, and its advantages, reference will now be made in the fcl.lowing Detailed Description t.o the .'i accompanying drawings, in which:
FIGURE 1 is a schematic diagram illustrating components of a circuit-switched wireless system and a packet-switched wireless: system incorporating the present invention;
FIGURE 2 :i.s a schematic illustration cf the geographic area of coverage of the circuit-switched and packet-switched wireless networks shown i.n the functional schematic illustration of FIGURE l;
FIGURE 3 is a message diagram illustrating the 1'i flow of messages through a circuit-switched voice network and a packet-switched data network c>f the prior art;
FIGURE 4 is a message diagram illustrating the flow of messagE=_s through a circuit-switched voice network and a packet.-switched data network incorporating the first. embodiment of the prc=sent invention, setting up a call originating in the circuit-switched voice network to a mobile terminal camped on to a packet-switched data network;
2_'> FIGURE 5 is a messaue diagram illustrating the flow of messages between a circuit-switched ne~.work and a packet-sw:_tched network in a second embodiment of the invention; and FIGURE 6 is a messaging diagram illustrating the flow of messages between a circuit-switched network and a packet-switched network in a third embodiment of the invention.
_g-DETAILED DESCRI?'I'I:ON

Referring now to FIGURE l, there is shown a wireless telecomrnanications network 100, compri;~ing a circuit-sw.itche~network 110 and a packet-sw:it.ched network 12 0. The network 100 provides voice, SMS and data transmission services to a mobile terminal. (MT) 130 through wireless links 132 and 134. I-~ the embodiment shown, circuit-switched network 110 operates in accordance with ANSI-41 standards and packet-switched network 120 operates in accordance with proposed standard GPRS-136; however, it will be apparent to ttnose skilled in the art that other circuit-switchec:l and packet-switched networks can use or incorporate the present invention. The wireless telecommunications network 100 provides wireless telecommunicatic:m services to MT 130 from a public switched telephone network (PSTN) 140, the Internet 150, or other packet-switched networks, as well as other mobile :.erminals (not shown). Provisional Application Serial No. 60/094,035 is herein incorporated by reference for all purposes.

The MT 1317 is shown in FIGURE 1 coupled to a Terminal Equipment: (TE) 136 that comprises a personal computer or other data processing device. As shown servicing TE 136, the MT 130 is a dual-mode terminal capable of comml.zn.i.cation with networks 110 and 120 via wireless links 132 and 134, respectively. It will be apparent that MT 130 may alternatively be a mobile telephone or other device capable of servicing a user with data and voice transmissions with circuit-switched network 110 and packet-switched network 120.

Circuit-switched network 110 includes functional objects typical of ANSI-41 systems. Specifically, mobile switch controllers (MSC) 111, 112 and 113 are circuit switches that perform numerous operation and control functions within t:he network 110, including directing traffic, and messages, as well as performing call setup fun d=ions. MSC 1~1 is coupled to home location register (HLR) 11.4; MSC 112 is coupled to visiting location register (VLR) 115; and MSC 1.13 is coupled to VLR l~6. HLR 114 maintains information. and features relating to each MT originally registered within the network: 110, while VLR 115 and 116 ma_Lntain such information with respect to all MTs act=ually registered within the network 1I0.
One or more Base Transceiver Stations (BTS) 117, 118 and 119 transmit and receive radio communications over wireless Links similar to 1_ink 132, under the direction and control of MSC 113. Certain operation and control information and parameters are exchanged between MT 130 anal one or more of BTS 117, 118 and 119 via a Digital Control Channel (DCCH) over the wireless link 132.

Packet-switched network 120 includes functional objects typical of those envisioned for the proposed GPRS-136 data transmissioru network. The proposed standards relating to GPRS-136HS architecture are hereby incorporated by reference for all purposes.

Specifically, a Serving GPRS Support Node (SGSN) 121 is connected by a telecommunication link to Gateway GPRS Support Node (GGSN) 122_. Both the SGSN 121 and GGSN 122 are connected by telecommunication links to GPRS HLR 123, which provides information similar to HLR 114 of the circuit-switched network 110. It should be noted that GPRS HLR 123 provides essentially the same information and functionality as an HLR

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currently used in GSM mobile systarns. SGSh 7?1 is coupled to a nu:rber of Base Statioa5 Subsystem (SSS) 123, 129 an3 125, which are each capable oz traasm~tting and rece~.ving data to and from 1~T 130 via a radio link similar to m reless link 134_ lr:e w:,x'eless link 139 includes, .a aadltio:t to da=G
infor:r.ation, rnanacement and control in~orr.',ation transmitted via a PaCke~ Control Chant.~i (F~C:ii .
Cort~mur~icatxon between the network 110 ar_a MT 130 is acrocnplisried us~.ng TDMn technology; ?:owever, ~.t w=11 be apparent that other wireless t:arhnnlogies, rich as CDMA, GSM and CDMA-20C0, could be utzlizea d5 well.
It will be aopar2nt: that the configarat_Cn Of circuit-switched network 114 and a packet-scorched network 120 shown. in: FIGURE 1 is for purFoses of illustration. Accozdincly, numerous additional functional ob3ects appa~er.t to those skilled in the art are typical-y incorporated in such netHarks. The packet-switched network 120 trar.smit3 data to and from the MT 130 utilizing GPRS technology: ho~revsr, it will be apparew that EbCE data transm=ssion and ;~trieL
technology ~aay be utilized as well.
Netr.orks 110 arid 120 interface thrcugh MSC 1.?
ana SGSN 12i through a sig.~.aling interface which typically is used Lo transmit :-ontrol messaging. M5C
112 is designated the "gateway" MSC for the syszen 110, as is indicated by the da5~gnazion "Gw." For parpcses of example, MSC I';1 is Cesignated the "originating call'' MSC and the:2fore bears the designation "0." NS~C 113 functions as the "serm ag"
fdSC and therefore bears the des=gnat~on "S."

AMENDED SHEET

At the timE=~ of an incoming cai,~, MT 130 is idle, but is camped on one or more of BSS 123, 124 and 125, awaiting are incoming call from the voice network 110 or data transmis:~ion from ~he da~a network 120. The preference for camping on the packet-switched data network 120 under the proposed GPRS-136HS standard avoids unnecessary use of air time, bandwidth and other resources in both the circuit-switched voice network 110 and the packet-switched data network 120.

When an incoming call to MT 130 is placed over a voice channel originating in the circuit-switched network 11C, a voice channel must be established via a wireless link, such as link 132. The call is set up, allowing full duplex (two way) communication between MT 130 and the calling party through the circuit-switched network 110, by signaling over both the DCCH and PCCH channels of the wireless links 132 and 134. This is accomplished by first sending a page request to set up the call. Typically, at the time a page for a voice transmission is received by MT 130, the wireless l~n}: 134 to the data network 120 is discontinued. Its will therefore be appreciated that wireless links 132 and 134 are not active simultaneously under the existing ANSI-41 and GPRS-136HS standards. However, the present invention could be incorporated i.n systems in which wireless voice link 132 and wirE:less data link 134 are substantially continuously active, allowing substantially concurrent voice and data transmissions.

The present. invention facilitates setup of a full duplex telephone call originating in the network 110 to the MT 130 by providing to the network 110 r".T.?.n...~ ' C ~ rf? ~ ::. ~ G4:'_:.~..~.:5.~./t;.~..~y.:.~.:~::.
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~.nformat~an represerrtirrg the location of MT 130. The assccZated benefits are illustrated with reference to FIGURES 1 and 2. ~'IGLRE 2 illustrates the geographic location of components acrd coverage areas of a circui~-switched network (voice network? 110 and a geographically overlapping packet-switched network data network) 120. Base Transceiver Stations simi3~ax to HTSs 117, 118 and 1'!9 of FIG. 1 are shown as triangles in FIG. 2 and Base Stations similar to BSSs 123, 12~ and 125 associated with the packet-switched network I20 are illustrated as c~.rcles. The coverage area and componenLS of the vaice network 110 are illustrated in solid lines, whereas the components and coverage area of the data net:~ork area 120 is illustrated by broken lines. The geographic area of coverage by the voice network 110 comprises req~.arrs A, 8 and C, serviced by MSCs 113A, 1138 and 1130, respectively, providing service similar to t:he single MSC 113 shown elsewhere in the FIGURES. It will be apparent that MSCs 111, 112 and 113 pravide multiple functions beyond those described in the example of call setup described here. Similarly, the coverage area of the data network 120 is region D
and is serviced by SGSN 121. For purposes of example, MTs 130, 131, 132, and 133 are shown at different locations within the coverage areas of both the voice network 110 and the data network 120.
Referring still to FIGURES 1 and 2, the pre$ent invention avoids delays of typically 3 to 5 seconds per call caused by the creed to complete a page of an MT
3Q thxongh the data network 120 and receipt of a page response before the voice network 110 ca:~ initiate ~'._~.,_ . ~~~~ap~D S~-!EET

setup of the cal=L. Specifically, because an MT will be camped on the data network 120 when it must be paged for an incoming call, the page must be routed through the data network 120. This entails transmission time through the data network 120, both to and from the MT to which the call is intended, because the loc~:rtion of the MT is not provided to the voice network 110.

The present invention avoids this delay by providing the voice network 110 with information representing thc:~ location of the MT within the data network 120 beror_e a page response is received From the MT through rh:e data network 120, thereby allowing the call setup routine to be initiated with :Less delay. Such provision of MT location information to the voice netwozr: 110 is expected to reduce the r<~dio transmission time between the MT and the voice network 110 by as much as 2 or 3 percent, thereby increasing the capacity arud reducing the overall cost of the system.

Referring now to FIGURE 3, there is shown a message diagram illustrating tl:e flow of messages in the prior art delaying initiating a call setup routine until a page response is received from the MT through the data network in which it is served. MT 130 is shown camped on a PCCH associated with BSS 125. An incoming call is originated through MSC-0 111, which in turn sends a location request (LOCREQ) to HLR :L14.

Routing Requests (ROUTREQ) are then sent in series from HLR 114 and VLR 115 to the gateway MSC 112. MSC

112 then encapsulates a page message directed to the Rc.'1!..:Vn!~1..-..FE'.~..-.,hILrETICHE!\ OS :30- 6- 0 :
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i~DF~TH12$2002 M'~ 230 for transmission through an IP tunnel using wzll-known methods and means.
The page is directed to BSS 125, on which MT 13C is camped. 8SS 125 is selected by the SGSN 121 to sex-vice MT 130 while it is camped on the data network 120, because the PCCH of BSS 225 provides the strongest signal of adjacent transmitters and consequently is one of the closest geogxvapl~ica~.ly to MT 130. Therefore, the geographic location of eSS 125 also provides the approximate location of MT I3L~ .
Upon receiving the page from the data network 120 over t:he PCCH channel on which MT 130 is camped, MT 13a transmits a page respanse to the voice network 110 over its DCCH channel. The page response is received by a neighboring BTS 129 and transmitted to MSC 113, which then initiates the call setup sequence. Dntil receipt of the page response by MSC 113 from the 8TS 139 tear ~JT
130, ~che voice network 1'0 does not have useful information representing the location of the Mx 130.
Following recEipt by MSC 113 of the page xesponsa, an i3nsolicittd Response (UNSohRESy message, including a Temporary 3~oca.l Directory Nzunber (TLDN) , is sent to the gateway MSC 112. MSC 112 acknowledges receipt of the unsalicited response and TLDN from MSC 113 with a retcxrn Unsolicited Response Return Result (unsolres).
Following the ackncwledgment, MSC lI2 transmits a Route Reguest Return Result (routreq~ forwarding the TLDN to the VLR 115. The TLDN is then forwarded by the VLR 115 to the HLR 114. The HLR 119, in turn. transmits a 3Q Location Request Return Result (locreq) forwarding the TLDN to the MSC 111 from which the call ...CA 02338512 2001-O1-23 .::.,::;::<.:>:::~::.::::.::-:.;::.;..: ::.::.:.:.:.:.:: <:. .;.. :.:-":
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I3oRTHi282002 was originated. Upon receipt of the TLDN by the originating MSC 111 from the serving MSC 113, the call is set up, and cut. through is completed. From th~.s point, a full duplex ttwo way) telephone call can be conducted between the user of MT 130 and the party originating the incoming call.
It should be apparent that the prior art shown i1~
and described with reference to FIGURE 3 achieves call setup without infc~rirat~.s~n represe:zzinq the location of MT 130 being provided to the voice network 110 from the data network 124. Instead, receipt of the page response from MT 130 by the serving N!SC 113 provides the first indicaticn of the ~iflcation of MT 130. Prior to that time, tMe voice network 110 receives no indication of 13 which 1~SC wi.th~.n the network will service MT 130. As a result, the call setup rautiae beginning with transmission of the TLDN by MSC 113 cannot be initiated.
Consequently, initiation of the call setup routine is delayed by the need to await the page response from the MT i30 from wherever iz is geographica3.ly located within the voice network 1:10.
Referring now to FIGURES l, 2 and 4, shown ~s the method and means by which the present invention avoids the delay in call setup occasioned in the prior art when an incoming calf. originates with~.n a circuit-switched network 110 to an MT 130 camping on a data network 120.
In FIG. 2, !HT 330 is shown camped on the PCCFi channel of an adjacent ASS 125 of the data network 120. MT 130 periodically notifies BSS i25 of its presence whale idle, aWa~.ting receipt. of transmissions from the data netwo.ck 120. The frequency of such notification i.s adjustable and is i'y~~:.~~:~>::::v:~"s~-:::::y.:.~l~' :.:::.
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AMENDED S~iEET

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NOR:HI2$2002 preferably once each hour. The MT 134 may indicate iZs presence when. handing off to or registering with a riew B5S _ Information indicating that c~T 230 is camped on BSS 125 is in turn transmitted by 8SS 125 to SGSN 121 following receipt. SGSN 121 stares and updates such locarion information in a look-up table ar database maintained by or co-located with the SGSI~ 121. The GPRS
HLR 123 is typically notified and stares the identity of the SGSN ser~rng the MT 130 when MT 130 enters the area served by that SGSN.
Should MT 130 move within the data network 120 to a location shown in FiG. 2 as occupied by MT 133, far example, the location data representing the locatia:~ of MT 3.30 is updated by the SGSN 121. In tris manner, the i5 data network 120 can effectively monitor and store the data or other information representing the location of MT 130 within the network. Therefore, data network 120 will maintain and store information represer~tizg the location of MT 130 within the region D se_viced by SGSN
121. Similarly, tre information representing Lhe location of MTs 131,. 132 and 133 can be maintained and stored by the data network 120.
As is best shown in FIGURE 2, each of MSCs 113A, 113H and 113C, which represent a31 or a portion of the 2S vci.ce network 11D, services its respective region Pr B
and C through associated BfSs to which each MSC ~.s linked. In the example shown, MSC 112, which functions as the gateway MSC, interfaces directly with SGSN 121., but is not shown. MsC 112 preferably maintains a datalaase, look-~:p table or other means through wh~.ch znfo.razation regreseriting the location of ar. MT in the data network 12D ca:n be mapped or crass-referenced to _17_ FiYY: ~ :~ :: ~ i:
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tVORTH1282002 a corresponding location within the voice network 130.
Such information is preferably stored and accessed from the 4'LR 115 associated with gateway MSC 112.
To facilitate and expedite call setup in the present invention, SGSN 121 provides to MSC 112 information representing the approximate location of an MT to which an incoraing call from the voice network 110 is directed. Such information is provided to the gateway MSC 11.2 prior to receipt by any MSC of the voice network 110 ef a page .response from the i~:T called. Such information is used by the MSC 112 to determine in which of regions A, B and C the called MT is approximately located. MSC 112 then directs the MSC serving that region tc initiate a service gage to the called MT
without the need to await a response from the MT
initiated by a page from the data network 120. This not only avoids the delay associated with the data network page and response fwom the MT, but also avoids the need to expend resources unnecessarily by directing a global page to determine the location of the called MT.
Using this method and means of the present invention, MSC 1138 initiates call setup with MT 132 at the direction of MSC 112 and with reference to location information received from SGSN 121, indicating that MT
132 at least has a h:.gh probability of being located in region B. Similarly, MSC I13A initiates call setup with MT 131 and at the direction of MSC 122, based on location information received from SGSN 123, indicating that the l.vcation of MT 131 is approximately within region A. In like manner, MSC 113C initiates call setup with MT 133, with reference to location information received froia _18_ Pri~~.~~i':-~_ v9:
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NfJftTFi1282402 SGSN 121, indicating that MT 133 at least has a high probability of being located in region A.
Using such location information, the PCCH can optionally be confa_gured to direct the mobile to the DCCH freguencies or the particular one or more of regions) A, 8 and C: that the data network 120 indicates that a particular MT can be found.
Referring now to FIGURE 4, there is shown a messaging diagram i:Llustrating the seqc~ence of messages through and between :~et~;orks 11Q and 120, utilizing information representing at least an approximate location of MT 3.30 within the data network 120. The sequence of messages shown differs from the priQx~art ~.l~.ust.rated in FIG. 3 following zransmissio~ of the page message to the MT from the gateway MSC 1138 via an xP
Tunnel. As the tunneled page message is forwarded from the SGSN x.21 to the $SS 125, a message bearing location.
information data is transmitted by the packet-switched network SGSF~ 121 to the circuit-switched network gateway MSC 112. Such location information represents the approximate location of the MT 130 with.~n the data network 120.
The gateway MSC: 112 processes such information to determine which of regions A, B and C the location information correlates with or identifies. A3though i.n a preferred embod:.ment, MSC 112 makes th~.s determination, it will be appreciated triat such processing and data storage could also be performed by the data network 120, utilising SGSN 121. 'thus, the location information received by gateway MSC 112 from SGSN 121 may de an indication of the location of MT

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NORTFi1282002 130 within the data network 120, an zrdication of wh~.ch of regions A, 8 and C MT 130 is likely to be found in or a combination of such in.fnr~r~ation.
Fol.lowiz~g rece~.pt of the location information data, MSc 112 tr8nsmits an Inter System Page (ISPAGE) zo MSc 113, which is previously determined as servicing the region in which MT 130 is likely to be located. MSc 1138 responds with an inter System ?age Return Result (ispage) message to MSc 112, With a TLDN for use in completing call setup. The ThDN is then forwarded by the MSc 112 to the originating MSc 111 via a sequence of Rowing Request Return Resu?ts (routreq) and a Location Reguest Return Result via VLR 115 and HL,R 119. upon receipt of the TLDN, a ca~.l is set up between the MSc 113 serving MT 130 and the MSG 11I thxouqh which the incoming call originated.
aecause the call setup routine is triggered by the tunneJ.ed MT page, calf. setup is initiated pr=or zo receipt by the serv~.ng MSc 113 of a page response from the ESS 125 of the data network I20_ Thus, call setup is achieved with the present invention without regard to the tame at which a page response is received by the 8TS
li9 from the MT 130_ As a result, a delay of approximately 2 to 5 seconds is typically avoided, resulting in reduced demands on zhe resources of the voice network 110, an increase in capacity of the network and reduced costs.
Referring now to FIGi7RE 5, there is shown a me_=sage diagram il3ustrating use of the present invention to facilitate enhanced location-based services provided by the circuit-switched r_etwork 11Ø Such location-based services would incl~:de, for _24_ ::::::::....::..-.::..:::~....:::::....:~::::.......::...::.....::::~.......::::...:~...::......
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NORTFi12B2G02 example, voice-acz~.vateci directions to the nearest hospital or other location, the cost of call services within a particrslar location, as well as many others that will be apparent to those skilled in the art.
This is accomplished by providing a method and means by which a Location Service Node 200 providing location-based service and receiving a Service Request message can obtain information representing the current location of the MT 130. i7pon receipt of a Service Request, the Location Service Node 200 transmits a Location Query to the HLR 11.4. A series of Location Queries are then transmitted in succession by the VLR
115, to the MSC 112 and ultimately to the SGSN 121. ~n response to the Location Query, SGSN 121 provides location information such as that described with reference to FIGURES 1, 2 and 4, indicating the approximate location of the MT 130, within the voice neZWOxk 100. Success~.ve messages bearing such locatiar_ information are rranszuitted in series back to the Location Servrce Node 240. Location-based services are then provided with reference to such information representing the current geographic location of the MT
130.
Referring now to FIGURE 5, there is shown a message diagrafn illustrating a method and .means of providing to a Location Service Node 200 the current location of an MT. The LSN 200 tray provide a variety of lo=ation-based services, such as, for example, notifying a user of the airport gate from which the user's flight departs, as the user approaches the airport. Such flight nfarmation may be obtained by the LSN 200 via the Internet.
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LSN 200 sends a Location Request message t=o MSC

112, requesting a single or a periodic update of MT

location information of the user. FIGURE

illustrates one embodiment in which such updates are requested to be provided by MSC 112 to the L~~N 200 approximately every fifteen (15) minutes. MSC 112 responds to LSN 200 with a Request Acknowledgment, indicating that the location notification updatE= is initiated. MSC' 112 then, sends a Location Query message to SGSN 7_21, requesting receipt of a Current Locaticn message every fifteen (15) minutes, updating MSC 112 with .Location information indicating the approximate location of the MT within the data network 120.

MSC 112 then transmits a single Current Location message {shown in a broken line) to the LSN 200, providing the current MT location information.

Alternatively, a succession of Current Location messages are sent from MSC 11~.' to VLR 115, from VLR

115 to HLR 114, and from HLR 114 ultimately to LSN

200, providing the current MT :Location information to LSN 200.

The transmission of Current Location messages from SGSN 121 to the LSN 200 is repeated as frequently as is desired, taking into consideration the mobility of the MT, the services provided by LSN 200, the time of day and in accordance with numerous other factors apparent to those skilled in the art.

Upon receipt. of a Service Request message, LSN

200 provides location-based services, indicated by a generic Perform Service message, to the user with reference to the location inf=ormation received from the data network 120.

Claims

WHAT IS CLAIMED IS:

1. A method for initiating a telephone call setup in a wireless telecommunications network (100) comprising a packet-switched network (120) and a circuit-switched network (110), the telephone call originating in the circuit-switched network (110) and involving a wireless mobile terminal (130) at least at the receiving end of the telephone call, the wireless mobile terminal (130) being camped on a packet-switched network (120) via one or more available wireless links (139), the method comprising the steps of:
providing location information to she circuit-switched network (110) from the packet-switched network (120), the location information representing the location within the packet-switched network (120) on which the mobile terminal (130) is camped; and initiating call setup with the mobile terminal (130) through the circuit-switched network (110) by using the provided location information with reference to the location information received from the packet-switched network (120).
2. The method of Claim 1 wherein the location information representing the location of the mobile terminal (130) within the packet-switched network (120) is mapped to the location of one or more transceiver locations in the circuit-switched network (110).

3. The method of Claim 1 wherein the initiation of call setup between the mobile terminal (130) and the circuit-switched network (110) is triggered with reference to at least one page request tunneled through the packet-switched network (120) to the mobile terminal (130).
4. The method of Clam 1 wherein the location information is periodically provided to the circuit-switched network (110).
5. The method of Claim 1 wherein location-used telecommunication services are provided via the circuit-switched network (110) with reference to the location information.
6. The method of Claim 1 wherein the step of initiating further comprises the steps of:
determining from the location information an MSC
(113) servicing a region in which the mobile terminal (130) is likely to be located; and initiating a call setup through the MSC (113) to the mobile terminal (130).

7. The method of Claim 6 wherein the location information is stored by the packet-switched network (120).
8. The method of Claim 6 wherein the location information is stored by the circuit-switched network (110).
9. The method of Claim 7 wherein the location information is periodically updated.
11. The method of Claim 6 further comprising the step of the mobile terminal (130) sending a page response message responsive to being paged.
12. The method of Claim 11 further comprising the step of initiating a call setup routine independently of the page response message.
13. The method of Claim 6 further comprising the step of paging the mobile terminal (130) by transmission of a tunneled page message from the circuit-switched network (110) through the packet-switched network (110) to the mobile terminal (130).
14. The method of Claim 13 wherein the step of communicating further comprises providing the location information to the circuit-switched network (110) in response to the tunneled page message.

15. The method of Claim 13 wherein the transmission on of the tunneled page message triggers a call setup routine that is initiated before the circuit-switched network (110) receives a page response from the mobile terminal (130).
16. The method of Claim 13 wherein a channel of the packet-switched network (120) is configured to direct the mobile terminal (130) to a channel of the circuit-switched network (110) in accordance with the location information.
17. The method of Claim 13 further comprising the step of the channel of the packet-switched network (120) directing the mobile terminal (130) to the channel of the circuit-switched network (110) in accordance with the location information.
18. The method of Claim 13 wherein the step of communicating further comprises an SGSN (121) transmitting a message bearing the location information to a circuit-switched network (110) gateway MSC.
19. The method of Claim 6 further comprising the step of transmitting an inter-system page from a gateway MSC
(112) to a servicing MSC (113).
20. The method of Claim 19 further comprising the step of transmitting an inter-system page return result message from the servicing MSC (113) to the gateway MSC (112), the inter-system page return result message including a TLDN for use in competing call setup.

21. The method of Claim 20 further comprising the step of forwarding the TLDN to an originating MSC
(111).
22. A method of providing location-based services to a wireless mobile terminal (130) in a telecommunications wireless network (100) comprising 3 circuit-switched network (110), a packet-switched network (120), and a location service node (200), the wireless mobile terminal (130 being camped on a packet-switched network (120) via one or more available wireless links (134), the method comprising the steps of:
receiving a location-based service request from the mobile terminal (130) at the location service node (200);
transmitting a location query to the packet-switched network (120) in response to the location-based service request:
providing location information to the circuit-switched network (110) from the packet-switched network (120) in response to the location query, the location information representing the location within the packet-switched network (120) on which the mobile terminal (130) is camped;
transmitting the location information from the circuit-switched network (110) to the location service node (200): and providing at least one location-based service to the mobile terminal (134) using the provided location information.

23. The method of claim 22 wherein she step of transmitting further comprises transmitting the location query to an HLR (114).
24. The method of Claim 23 wherein the step of transmitting further comprises transmitting the location query to a VLR (115).
25. The method of Claim 29 wherein the step of transmitting further comprises transmitting the location query to an MSC (112).
26. The method of Claim 25 wherein the step of transmitting further comprises transmitting the location query to an SGSN (121).
27. The method of Claim 22 wherein the step of providing location information further comprises providing the location information to an MSC (112).
28. The method of Claim 27 wherein the step of providing location information further comprises providing the location information to a VLR (115).
29. The method of Claim 28 wherein the step of providing location information further comprises providing the location information to an HLR (114).
30. The method of Claim 29 wherein the step of providing location information further comprises providing the location information to the location.
service node by the HLR (114).

31. A method of providing the current location of a wireless mobile terminal (130) in a telecommunications wireless network (100) comprising a location service node (200), a packet:switched network (120), and a circuit-switched network 1110), the wireless mobile terminal (130) being camped on a packet-switched network (120) via one or more available wireless links (139), the method comprising the steps of:
transmitting a location request by the location service node (200) to the circuit-switched network (110):
in response to the location request, the circuit-switched network (110) transmitting at least one location query to the packet-switched network (120);
in response to the at least one location query, the packet-switched network (120) transmitting at least one current locating message to the circuit-switched network (110); and providing at least one current location message to the location service node (200).
32. The method of Claim 31 wherein the location request requests periodic updates of the current location of the mobile terminal (130).
33. The method of Claim 32 wherein the current location of the mobile terminal (130) is periodically updated in response to the location request.
34. The method of Claim 27 wherein the step of transmitting a location request further comprises sending a location request message to an MSC (112).

35. The method of Maim 30 further comprising the step of the MSC (112) sending a request acknowledgment to the location service node (200) in response to receipt of the location request message.
37. The method of Claim 34 wherein the step of the circuit-switched network (110) transmitting at least one location query to the packet-switched network (120) further comprises the MSC (112) sending at least one location query message to an SGSN (121).
38. The method of Claim 37 wherein the at least one location query message requests receipt of a current location message at a predetermined interval.
39. The method of Claim 31 wherein the slap of the packet-switched network (120) transmitting at least one current location message trough the circuit-switched network (110) to the location service node (200) further comprises a single current location message sent directly from a SGSN to the location service node via an MSC.
40. The method of Claim 31 wherein the step of the packet-switched network (120) transmitting at least one current location message through the circuit-switched network (110) to the location service node (200) further comprises a plurality of current location messages sent from an MSC (112) to a VLR (115), from the VLR (115) to an HLR (114), and from the HLR (114) to the location service node (200).

41. The method of Claim 1 further comprising the step of initiating a call setup routine independently of the page response message.
42. The method of claim 1 wherein the step of providing further comprises the steps of:
transmitting location information relative the mobile terminal (130) to the packet-switched network (120); and communicating the location information to a circuit-switched network (110).
43. A method for initiating a telephone call setup in a wireless telecommunications network (100) comprising a packet-switched network (120) and a circuit-switched network (110), the telephone call originating in the circuit-switched network (110) and involving a wireless mobile terminal (130) at least at the receiving end of the telephone call, the wireless mobile terminal (130) berg camped on a packet-switched network (120) via one or more available wireless links (134), the method comprising the steps of:
providing location information to the circuit-switched network (110) from the packet-switched network (120), the location information representing the location within the packet-switched network (120) on which the mobile terminal (130) is camped; and initiating call setup with the mobile terminal (130) through the circuit-switched network (110) by using the provided location information with reference to the location information received from the packet-switched network (120), the call setup being initiated independently of a page response from the mobile terminal (130).
CA002338512A 1998-07-24 1999-07-23 Enhanced call delivery system Abandoned CA2338512A1 (en)

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US9403598P 1998-07-24 1998-07-24
US60/094,035 1998-07-24
US09/359,818 1999-07-23
PCT/IB1999/001318 WO2000005907A2 (en) 1998-07-24 1999-07-23 Delivery of circuit switched calls to a mobile in packet data mode
US09/359,818 US6560457B1 (en) 1998-07-24 1999-07-23 Enhanced call delivery system for interoperability between circuit switched and packet switched networks

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