WO1999053711A1 - Local call termination handling in a radio telecommunications network - Google Patents

Local call termination handling in a radio telecommunications network Download PDF

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Publication number
WO1999053711A1
WO1999053711A1 PCT/SE1999/000489 SE9900489W WO9953711A1 WO 1999053711 A1 WO1999053711 A1 WO 1999053711A1 SE 9900489 W SE9900489 W SE 9900489W WO 9953711 A1 WO9953711 A1 WO 9953711A1
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WO
WIPO (PCT)
Prior art keywords
msc
called
hlr
call
determining
Prior art date
Application number
PCT/SE1999/000489
Other languages
French (fr)
Inventor
Hung Tran
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to AU41757/99A priority Critical patent/AU4175799A/en
Publication of WO1999053711A1 publication Critical patent/WO1999053711A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/12—Inter-network notification

Definitions

  • This invention relates to telecommunication systems and, more particularly, to a method of handling local mobile station (MS) terminations in a radio telecommunications network.
  • MS local mobile station
  • local MS termination is defined as a call routing procedure utilized when a mobile station originating a call and the called mobile station are located in the service area of the same mobile switching center (MSC).
  • the originating MSC O-MSC
  • the called subscriber's serving MSC or a transfer subscriber's serving MSC if the call is transferred to a third party.
  • Intersystem MS termination is defined as a call routing procedure utilized when the mobile station originating a call and the called mobile station are located in different MSCs. In other words, the O-MSC and the called subscriber's serving MSC (or a transfer subscriber's serving MSC) are different.
  • TLDN Temporary Location Directory Number
  • IS-41C introduced a provision for local MS termination. Under the IS-41C provision, whenever the HLR receives a Location Request Invoke, Origination Request Invoke, or Transfer-to Number Request Invoke message, the HLR determines whether the called subscriber is in the O-MSC. If so, the HLR returns a local termination parameter in a Location Request Return Result message to the O-MSC which then routes the call locally.
  • TLDN Temporary Location Directory Number
  • the mobility of the MS may cause problems with the procedure in IS-41C. This is because the procedure in IS-41C only works if the location in the HLR indicates that the MS is within the O-MSC when the call originates, and the called MS is, in fact, still within the O-MSC. Thus, there are two sets of circumstances under which the IS-41C procedure is deficient. First, if the MS location was shown to be in the O-MSC, but the MS has, in fact, moved out of the O-MSC to a visited MSC (V-MSC), a local MS termination will still be attempted. However, the O-MSC will not find the MS. Calls to this MS will fail until the location of the MS is updated in the HLR.
  • V-MSC visited MSC
  • the location stored in the HLR may show that the called MS is in a V-MSC when the call originates, but the MS may meanwhile move into the O-MSC (or respond to paging from the serving MSC with an unsolicited response in the O-MSC).
  • the HLR treats the call as an intersystem MS termination and returns a TLDN to the O-MSC.
  • the O-MSC utilizes the TLDN to route the call, but this wastes a TLDN since the call could be routed locally.
  • Maenpaa discloses a method for call establishment between a subscriber in a private branch exchange (PBX) and a cellular radio system.
  • PBX private branch exchange
  • the PBX determines whether the PBX is the home PBX of the calling subscriber. If so, the PBX accesses its own subscriber database to obtain subscriber information for the call rather than accessing a Visitor Location Register (VLR) in the cellular radio system.
  • VLR Visitor Location Register
  • Maenpaa eliminates unnecessary signaling when the calling subscriber is in his home area.
  • Maenpaa does not teach or suggest any method of performing local MS termination when a called mobile subscriber is located in the calling subscriber's MSC.
  • the present invention is a method of performing local termination of a call when a called mobile station (MS) is located in an originating mobile switching center (O-MSC) where the call originates in a radio -3- telecommunications network.
  • the network also includes a home location register (HLR) which includes location information for the called MS, and a serving MSC where the called MS is located.
  • the method comprises the steps of sending a routing request message from the HLR to the serving MSC, determining in the serving MSC whether the serving MSC is also the O-MSC, and routing the call locally in the O- MSC upon determining that the serving MSC is also the O-MSC.
  • the present invention is a method of performing local termination of a call in a radio telecommunications network, the network having an originating mobile switching center (O-MSC) where the call originates, a home location register (HLR) which includes location information for a called mobile station (MS), a visited MSC (V-MSC) bordering the O-MSC where the called MS was last located, and a paging area which extends across a border between the O-MSC and the V-MSC.
  • O-MSC originating mobile switching center
  • HLR home location register
  • MS called mobile station
  • V-MSC visited MSC
  • paging area which extends across a border between the O-MSC and the V-MSC.
  • the method begins by receiving a routing request message in the V-MSC requesting routing information for the called MS, sending an intersystem page message from the V-MSC to the O-MSC directing the O-MSC to page for the called MS in the paging area, and paging for the called MS in the paging area by the O-MSC and the V-MSC. If the called MS sends a page response to the O-MSC, it is determined in the O-MSC whether the called MS is responding to a call that originated in the O-MSC. If so, the call is routed locally in the O-MSC to the called MS.
  • the present invention is a method of performing local termination of a call in a radio telecommunications network, the network having an originating mobile switching center (O-MSC) where the call originates, a home location register (HLR) which includes location information for a called mobile station (MS), and a visited MSC (V-MSC) bordering the O-MSC where the called MS was last located.
  • the method begins by receiving a routing request message in the V-MSC requesting routing information for the called MS, and paging for the called MS by the V-MSC. If the O-MSC receives an unsolicited page response from the called MS, the O-MSC determines whether the called MS is responding to a call that originated in the O-MSC. If so, the O-MSC routes the call locally to the called MS.
  • FIG. 1 is a message flow diagram illustrating the flow of messages when the existing local MS termination procedures of IS-41C are implemented in a radio telecommunications network;
  • FIG. 2 is a message flow diagram illustrating the flow of messages when the local MS termination procedures of the present invention are implemented in a radio telecommunications network, and a local routing number is included in the Routing Request Return Result message;
  • FIG. 3 is a message flow diagram illustrating the flow of messages when the local MS termination procedures of the present invention are implemented in a radio telecommunications network, and the local termination parameter is included in the Intersystem Page Return Result message;
  • FIG. 4 is a message flow diagram illustrating the flow of messages when the local MS termination procedures of the present invention are implemented in a radio telecommunications network, and the local termination parameter is included in the Unsolicited Response Invoke message.
  • FIG. 1 is a message flow diagram illustrating the flow of messages when the existing local MS termination procedures of IS-41C are implemented in a radio telecommunications network.
  • the network includes an Originating Mobile Switching Center (O-MSC) 11, a Home Location Register (HLR) 12, and a Visited Mobile Switching Center (V-MSC) 13.
  • the HLR maintains location information for a called mobile station (MS) (not shown).
  • MS mobile station
  • the HLR may service several MSCs, and has information regarding the configuration and capabilities of the MSCs which it serves. For example, the MSC knows whether each MSC is capable of handling IS-41C message parameters such as the local termination message parameter.
  • the O- MSC When a call directed toward the called MS originates in the O-MSC 11, the O- MSC sends a Location Request (LOCREQ) Invoke message 14 to the HLR 12.
  • the HLR determines at 15 whether or not the called MS is located in the O-MSC. If not, the HLR determines which MSC the called MS is in (for example, V-MSC 13), and sends a Routing Request (ROUTREQ) Invoke message 16 to the V-MSC.
  • the V- MSC pages the MS and upon receiving a page response, returns a Temporary Location Directory Number (TLDN) to the HLR in a ROUTREQ Return Result message 17.
  • the HLR then returns the TLDN to the O-MSC 11 in a LOCREQ Return Result message 18.
  • the HLR determines at step 15 that the called MS is in the O-MSC 11, the HLR next determines at 19 whether or not the O-MSC is capable of handling the IS-41C local termination message parameter. If so, the HLR sends a LOCREQ Return Result message 21 to the O-MSC and includes the local termination message parameter. The O-MSC then routes the call locally at 22. However, if the O-MSC cannot handle the IS-41C local termination message parameter, the HLR sends a LOCREQ Return Result message 23 to the O-MSC and includes a DMH_Redirection Indicator parameter. This parameter is an IS-41C parameter which indicates that the call should be handled as a local termination. If the O-MSC is supports IS-41C or later, the O-MSC routes the call locally to the called MS at 24.
  • the present invention provides a solution to the situation in which the O-MSC does not support IS-41C or a TLDN must be utilized to route a call within the O-MSC.
  • the serving MSC determines whether it is also the O-MSC. If the serving MSC determines that it is also the O-MSC, then the serving MSC routes the call locally.
  • the O-MSC returns a local routing number or other indication to the HLR to indicate that the call is being handled as a local MS termination.
  • the local routing number or local termination parameter is included in the Routing Request Return Result message, the Intersystem Page Return Result message, or the Unsolicited Response Invoke message whenever the serving MSC is also the O-MSC.
  • FIG. 2 is a message flow diagram illustrating the flow of messages when the local MS termination procedures of the present invention are implemented in a radio telecommunications network, and a local routing number is included in the Routing Request Return Result message.
  • the network includes an O-MSC 31, a HLR 32, and a V-MSC 33.
  • the HLR maintains location information for a called mobile station (MS) (not shown).
  • MS mobile station
  • the HLR may service several MSCs, and has information regarding the configuration and capabilities of the MSCs which it serves, including the capability of each MSC to handle IS-41C message parameters such as the local termination message parameter.
  • the O- MSC When a call directed toward the called MS originates in the O-MSC 31, the O- MSC sends a LOCREQ Invoke message 34 to the HLR 32.
  • the HLR determines at 35 whether or not the called MS is located in the O-MSC. If not, the HLR determines which MSC the called MS is in (for example, V-MSC 33), and sends a ROUTREQ Invoke message 36 to the V-MSC.
  • the V-MSC pages the MS and upon receiving a page response, returns a TLDN to the HLR in a ROUTREQ Return Result message 37.
  • the HLR then returns the TLDN to the O-MSC 31 in a LOCREQ Return Result message 38.
  • the HLR determines at step 35 that the called MS is in the O-MSC 31, the HLR next determines at 39 whether or not the O-MSC is capable of handling the local termination message parameter. If so, the HLR sends a LOCREQ Return Result message 41 to the O-MSC and includes the local termination message parameter. The O-MSC then routes the call locally at 42. However, if the O-MSC cannot handle the local termination message parameter, the HLR determines at 43 whether or not the O-MSC supports IS-41C or later. If so, the HLR sends a LOCREQ Return Result message 44 to the O-MSC and includes a DMH Redirection Indicator parameter which indicates that the call should be handled as a local termination.
  • the O-MSC then routes the call locally at 45. If it is determined at 43 that the O-MSC does not support IS-41C or later, the HLR sends a ROUTREQ Invoke message 46 to the O-MSC.
  • the ROUTREQ Invoke message includes the MSC-ID of the MSC which originated the call (the O-MSC-ID).
  • the O-MSC determines at 47 whether the O-MSC-ID included in the ROUTREQ Invoke message is the same as its own MSC-ID. In this case, the O-MSC-ID matches the MSC-ID of O-MSC 31.
  • O-MSC then sends a ROUTREQ Return Result message 48 to the HLR and includes a local routing number and indication that the call is being routed locally.
  • the HLR sends a LOCREQ Return Result message 49 to the O-MSC and includes the local routing number.
  • the O-MSC then routes the call locally the called MS at 47 without utilizing a TLDN.
  • An Intersystem Page Invoke message may be sent from a serving MSC to a -7- border MSC to set up a paging area which extends across the border between the two MSCs.
  • the border MSC includes the local termination parameter in the Intersystem Page Return Result message if the border MSC is the originating MSC. This scenario is illustrated in FIG. 3.
  • FIG. 3 is a message flow diagram illustrating the flow of messages when the local MS termination procedures of the present invention are implemented in a radio telecommunications network, and the local termination parameter is included in the Intersystem Page Return Result message.
  • the network includes the O-MSC 31, the HLR 32, the V-MSC 33 which borders the O-MSC, and a called mobile station (MS) 50.
  • MS mobile station
  • the O-MSC sends a LOCREQ Invoke message 51 to the HLR 32 and includes the Mobile Identification Number (MIN) of the called MS 50.
  • MIN Mobile Identification Number
  • the HLR sends a ROUTREQ Invoke message 52 to the V-MSC 33.
  • the V-MSC determines that the location of the called MS is in a paging area which extends across the border with the bordering O-MSC 31, the V-MSC sends an Intersystem Page Invoke message 53 to the O-MSC. Both the V-MSC and the O-MSC then page for the called MS in the paging area at 54 and 55, respectively. At 56, the called MS sends a page response to the O-MSC.
  • the O-MSC determines whether or not it was the MSC which originated the call. If not, the O-MSC sends an Intersystem Page Return Result message 58 to the V-MSC and includes a TLDN. The V-MSC sends a ROUTREQ Return Result message 59 to the HLR, and the HLR sends a LOCREQ Return Result message 61 to the O-MSC with the TLDN. However, if the O-MSC determines at 57 that it is also the originating MSC, then the O-MSC sends an Intersystem Page Return Result message 62 to the V-MSC and includes the local termination parameter.
  • the V-MSC sends a ROUTREQ Return Result message 63 to the HLR, and the HLR sends a LOCREQ Return Result message 64 to the O-MSC with the local termination parameter.
  • the O-MSC then routes the call locally at 65.
  • a called MS may be operating in a V-MSC close to the border of the O-MSC.
  • the V-MSC receives a RoutReq Invoke message from the HLR, the V-MSC pages the MS.
  • the MS may respond by sending an unsolicited page response to the O-MSC.
  • the O-MSC determines whether it is -8- the MSC which originated the call. Since it is, the call is routed locally. This scenario is illustrated in FIG. 4.
  • FIG. 4 is a message flow diagram illustrating the flow of messages when the local MS termination procedures of the present invention are implemented in a radio telecommunications network, and the local termination parameter is included in the Unsolicited Response Invoke message.
  • the network includes the O-MSC 31, the HLR 32, the V-MSC 33 which borders the O-MSC, and the called MS 50.
  • the O-MSC sends a LOCREQ Invoke message 71 to the HLR 32 and includes the MIN of the called MS 50.
  • the HLR sends a ROUTREQ Invoke message 72 to the V-MSC 33.
  • the V-MSC pages for the called MS at 73, but the MS responds with an unsolicited response to the bordering O-MSC at 74.
  • the O-MSC determines whether or not it was the MSC which originated the call. If not, the O-MSC sends an Unsolicited Response Invoke message 76 to the V-MSC and includes a TLDN. The V-MSC sends a ROUTREQ Return Result message 77 to the HLR, and the HLR sends a LOCREQ Return Result message 78 to the O-MSC with the TLDN. However, if the O-MSC determines at 75 that it is also the originating MSC, then the O-MSC sends an Unsolicited Response Invoke message 79 to the V-MSC and includes the local termination parameter.
  • the V-MSC sends a ROUTREQ Return Result message 81 to the HLR, and the HLR sends a LOCREQ Return Result message 82 to the O-MSC with the local termination parameter.
  • the O-MSC then routes the call locally at 83.

Abstract

A method of performing local termination of a call to a called mobile station (MS) (50) in a radio telecommunications network. Whenever a mobile switching center (MSC) (31) receives either a routing request invoke message (46) from a home location register (HLR) (32), a page response (56) during intersystem paging with a bordering visited MSC (V-MSC) (33), or an unsolicited page response (74), the MSC determines whether it is the originating MSC (O-MSC) (31) for the call. If so, the MSC routes the call locally to the called MS (50). If the O-MSC is capable of handling IS-41C local termination parameters, the O-MSC sends the local termination parameter in response messages to the HLR or a bordering visited MSC (V-MSC) to indicate that the call is being routed locally. If the O-MSC is not capable of handling IS-41C local termination parameters, the O-MSC sends a local routing number to the HLR or the V-MSC to indicate that the call is being routed locally.

Description

LOCAL CALL TERMINATION HANDLING IN A RADIO TELECOMMUNICATIONS NETWORK
BACKGROUND OF THE INVENTION
Technical Field of the Invention
This invention relates to telecommunication systems and, more particularly, to a method of handling local mobile station (MS) terminations in a radio telecommunications network.
Description of Related Art
For purposes of describing the present invention, "local MS termination" is defined as a call routing procedure utilized when a mobile station originating a call and the called mobile station are located in the service area of the same mobile switching center (MSC). In other words, the originating MSC (O-MSC) is also the called subscriber's serving MSC (or a transfer subscriber's serving MSC if the call is transferred to a third party). "Intersystem MS termination" is defined as a call routing procedure utilized when the mobile station originating a call and the called mobile station are located in different MSCs. In other words, the O-MSC and the called subscriber's serving MSC (or a transfer subscriber's serving MSC) are different.
Before IS-41C was introduced, all MS terminations were handled as intersystem MS terminations. Whenever the HLR received a request for location information for a MS, the HLR returned a Temporary Location Directory Number (TLDN) to the requesting MSC. IS-41C introduced a provision for local MS termination. Under the IS-41C provision, whenever the HLR receives a Location Request Invoke, Origination Request Invoke, or Transfer-to Number Request Invoke message, the HLR determines whether the called subscriber is in the O-MSC. If so, the HLR returns a local termination parameter in a Location Request Return Result message to the O-MSC which then routes the call locally.
However, the mobility of the MS may cause problems with the procedure in IS-41C. This is because the procedure in IS-41C only works if the location in the HLR indicates that the MS is within the O-MSC when the call originates, and the called MS is, in fact, still within the O-MSC. Thus, there are two sets of circumstances under which the IS-41C procedure is deficient. First, if the MS location was shown to be in the O-MSC, but the MS has, in fact, moved out of the O-MSC to a visited MSC (V-MSC), a local MS termination will still be attempted. However, the O-MSC will not find the MS. Calls to this MS will fail until the location of the MS is updated in the HLR. In a second circumstance, the location stored in the HLR may show that the called MS is in a V-MSC when the call originates, but the MS may meanwhile move into the O-MSC (or respond to paging from the serving MSC with an unsolicited response in the O-MSC). In this case, the HLR treats the call as an intersystem MS termination and returns a TLDN to the O-MSC. The O-MSC utilizes the TLDN to route the call, but this wastes a TLDN since the call could be routed locally.
Although there are no known prior art teachings of a solution to the aforementioned deficiency and shortcoming such as that disclosed herein, PCT Patent Application WO 95/01075 to Maenpaa discusses subject matter that bears some relation to matters discussed herein. Maenpaa discloses a method for call establishment between a subscriber in a private branch exchange (PBX) and a cellular radio system. In Maenpaa, when the subscriber in the PBX originates a call, the PBX determines whether the PBX is the home PBX of the calling subscriber. If so, the PBX accesses its own subscriber database to obtain subscriber information for the call rather than accessing a Visitor Location Register (VLR) in the cellular radio system. Thus, Maenpaa eliminates unnecessary signaling when the calling subscriber is in his home area. However, Maenpaa does not teach or suggest any method of performing local MS termination when a called mobile subscriber is located in the calling subscriber's MSC.
Review of the foregoing reference reveals no disclosure or suggestion of a method such as that described and claimed herein.
SUMMARY OF THE INVENTION
In one aspect, the present invention is a method of performing local termination of a call when a called mobile station (MS) is located in an originating mobile switching center (O-MSC) where the call originates in a radio -3- telecommunications network. The network also includes a home location register (HLR) which includes location information for the called MS, and a serving MSC where the called MS is located. The method comprises the steps of sending a routing request message from the HLR to the serving MSC, determining in the serving MSC whether the serving MSC is also the O-MSC, and routing the call locally in the O- MSC upon determining that the serving MSC is also the O-MSC.
In another aspect, the present invention is a method of performing local termination of a call in a radio telecommunications network, the network having an originating mobile switching center (O-MSC) where the call originates, a home location register (HLR) which includes location information for a called mobile station (MS), a visited MSC (V-MSC) bordering the O-MSC where the called MS was last located, and a paging area which extends across a border between the O-MSC and the V-MSC. The method begins by receiving a routing request message in the V-MSC requesting routing information for the called MS, sending an intersystem page message from the V-MSC to the O-MSC directing the O-MSC to page for the called MS in the paging area, and paging for the called MS in the paging area by the O-MSC and the V-MSC. If the called MS sends a page response to the O-MSC, it is determined in the O-MSC whether the called MS is responding to a call that originated in the O-MSC. If so, the call is routed locally in the O-MSC to the called MS.
In yet another aspect, the present invention is a method of performing local termination of a call in a radio telecommunications network, the network having an originating mobile switching center (O-MSC) where the call originates, a home location register (HLR) which includes location information for a called mobile station (MS), and a visited MSC (V-MSC) bordering the O-MSC where the called MS was last located. The method begins by receiving a routing request message in the V-MSC requesting routing information for the called MS, and paging for the called MS by the V-MSC. If the O-MSC receives an unsolicited page response from the called MS, the O-MSC determines whether the called MS is responding to a call that originated in the O-MSC. If so, the O-MSC routes the call locally to the called MS.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and its numerous objects and -4- advantages will become more apparent to those skilled in the art by reference to the following drawings, in conjunction with the accompanying specification, in which:
FIG. 1 (Prior Art) is a message flow diagram illustrating the flow of messages when the existing local MS termination procedures of IS-41C are implemented in a radio telecommunications network;
FIG. 2 is a message flow diagram illustrating the flow of messages when the local MS termination procedures of the present invention are implemented in a radio telecommunications network, and a local routing number is included in the Routing Request Return Result message;
FIG. 3 is a message flow diagram illustrating the flow of messages when the local MS termination procedures of the present invention are implemented in a radio telecommunications network, and the local termination parameter is included in the Intersystem Page Return Result message; and
FIG. 4 is a message flow diagram illustrating the flow of messages when the local MS termination procedures of the present invention are implemented in a radio telecommunications network, and the local termination parameter is included in the Unsolicited Response Invoke message.
DETAILED DESCRIPTION OF EMBODIMENTS
FIG. 1 is a message flow diagram illustrating the flow of messages when the existing local MS termination procedures of IS-41C are implemented in a radio telecommunications network. The network includes an Originating Mobile Switching Center (O-MSC) 11, a Home Location Register (HLR) 12, and a Visited Mobile Switching Center (V-MSC) 13. The HLR maintains location information for a called mobile station (MS) (not shown). The HLR may service several MSCs, and has information regarding the configuration and capabilities of the MSCs which it serves. For example, the MSC knows whether each MSC is capable of handling IS-41C message parameters such as the local termination message parameter.
When a call directed toward the called MS originates in the O-MSC 11, the O- MSC sends a Location Request (LOCREQ) Invoke message 14 to the HLR 12. The HLR determines at 15 whether or not the called MS is located in the O-MSC. If not, the HLR determines which MSC the called MS is in (for example, V-MSC 13), and sends a Routing Request (ROUTREQ) Invoke message 16 to the V-MSC. The V- MSC pages the MS and upon receiving a page response, returns a Temporary Location Directory Number (TLDN) to the HLR in a ROUTREQ Return Result message 17. The HLR then returns the TLDN to the O-MSC 11 in a LOCREQ Return Result message 18.
However, if the HLR determines at step 15 that the called MS is in the O-MSC 11, the HLR next determines at 19 whether or not the O-MSC is capable of handling the IS-41C local termination message parameter. If so, the HLR sends a LOCREQ Return Result message 21 to the O-MSC and includes the local termination message parameter. The O-MSC then routes the call locally at 22. However, if the O-MSC cannot handle the IS-41C local termination message parameter, the HLR sends a LOCREQ Return Result message 23 to the O-MSC and includes a DMH_Redirection Indicator parameter. This parameter is an IS-41C parameter which indicates that the call should be handled as a local termination. If the O-MSC is supports IS-41C or later, the O-MSC routes the call locally to the called MS at 24.
The present invention provides a solution to the situation in which the O-MSC does not support IS-41C or a TLDN must be utilized to route a call within the O-MSC. In the present invention, whenever a serving MSC receives a routing request message from the HLR, the serving MSC determines whether it is also the O-MSC. If the serving MSC determines that it is also the O-MSC, then the serving MSC routes the call locally. The O-MSC returns a local routing number or other indication to the HLR to indicate that the call is being handled as a local MS termination. In various scenarios, the local routing number or local termination parameter is included in the Routing Request Return Result message, the Intersystem Page Return Result message, or the Unsolicited Response Invoke message whenever the serving MSC is also the O-MSC.
FIG. 2 is a message flow diagram illustrating the flow of messages when the local MS termination procedures of the present invention are implemented in a radio telecommunications network, and a local routing number is included in the Routing Request Return Result message. The network includes an O-MSC 31, a HLR 32, and a V-MSC 33. The HLR maintains location information for a called mobile station (MS) (not shown). The HLR may service several MSCs, and has information regarding the configuration and capabilities of the MSCs which it serves, including the capability of each MSC to handle IS-41C message parameters such as the local termination message parameter.
When a call directed toward the called MS originates in the O-MSC 31, the O- MSC sends a LOCREQ Invoke message 34 to the HLR 32. The HLR determines at 35 whether or not the called MS is located in the O-MSC. If not, the HLR determines which MSC the called MS is in (for example, V-MSC 33), and sends a ROUTREQ Invoke message 36 to the V-MSC. The V-MSC pages the MS and upon receiving a page response, returns a TLDN to the HLR in a ROUTREQ Return Result message 37. The HLR then returns the TLDN to the O-MSC 31 in a LOCREQ Return Result message 38.
However, if the HLR determines at step 35 that the called MS is in the O-MSC 31, the HLR next determines at 39 whether or not the O-MSC is capable of handling the local termination message parameter. If so, the HLR sends a LOCREQ Return Result message 41 to the O-MSC and includes the local termination message parameter. The O-MSC then routes the call locally at 42. However, if the O-MSC cannot handle the local termination message parameter, the HLR determines at 43 whether or not the O-MSC supports IS-41C or later. If so, the HLR sends a LOCREQ Return Result message 44 to the O-MSC and includes a DMH Redirection Indicator parameter which indicates that the call should be handled as a local termination. The O-MSC then routes the call locally at 45. If it is determined at 43 that the O-MSC does not support IS-41C or later, the HLR sends a ROUTREQ Invoke message 46 to the O-MSC. The ROUTREQ Invoke message includes the MSC-ID of the MSC which originated the call (the O-MSC-ID). The O-MSC then determines at 47 whether the O-MSC-ID included in the ROUTREQ Invoke message is the same as its own MSC-ID. In this case, the O-MSC-ID matches the MSC-ID of O-MSC 31. Therefore, O-MSC then sends a ROUTREQ Return Result message 48 to the HLR and includes a local routing number and indication that the call is being routed locally. The HLR sends a LOCREQ Return Result message 49 to the O-MSC and includes the local routing number. The O-MSC then routes the call locally the called MS at 47 without utilizing a TLDN.
An Intersystem Page Invoke message may be sent from a serving MSC to a -7- border MSC to set up a paging area which extends across the border between the two MSCs. In the method of the present invention, if a page response is received in the border MSC, the border MSC includes the local termination parameter in the Intersystem Page Return Result message if the border MSC is the originating MSC. This scenario is illustrated in FIG. 3.
FIG. 3 is a message flow diagram illustrating the flow of messages when the local MS termination procedures of the present invention are implemented in a radio telecommunications network, and the local termination parameter is included in the Intersystem Page Return Result message. The network includes the O-MSC 31, the HLR 32, the V-MSC 33 which borders the O-MSC, and a called mobile station (MS) 50. When a call directed toward the called MS originates in the O-MSC, the O-MSC sends a LOCREQ Invoke message 51 to the HLR 32 and includes the Mobile Identification Number (MIN) of the called MS 50. The HLR sends a ROUTREQ Invoke message 52 to the V-MSC 33. If the V-MSC determines that the location of the called MS is in a paging area which extends across the border with the bordering O-MSC 31, the V-MSC sends an Intersystem Page Invoke message 53 to the O-MSC. Both the V-MSC and the O-MSC then page for the called MS in the paging area at 54 and 55, respectively. At 56, the called MS sends a page response to the O-MSC.
At 57, the O-MSC determines whether or not it was the MSC which originated the call. If not, the O-MSC sends an Intersystem Page Return Result message 58 to the V-MSC and includes a TLDN. The V-MSC sends a ROUTREQ Return Result message 59 to the HLR, and the HLR sends a LOCREQ Return Result message 61 to the O-MSC with the TLDN. However, if the O-MSC determines at 57 that it is also the originating MSC, then the O-MSC sends an Intersystem Page Return Result message 62 to the V-MSC and includes the local termination parameter. The V-MSC sends a ROUTREQ Return Result message 63 to the HLR, and the HLR sends a LOCREQ Return Result message 64 to the O-MSC with the local termination parameter. The O-MSC then routes the call locally at 65.
In another scenario, a called MS may be operating in a V-MSC close to the border of the O-MSC. When the V-MSC receives a RoutReq Invoke message from the HLR, the V-MSC pages the MS. However, the MS may respond by sending an unsolicited page response to the O-MSC. The O-MSC then determines whether it is -8- the MSC which originated the call. Since it is, the call is routed locally. This scenario is illustrated in FIG. 4.
FIG. 4 is a message flow diagram illustrating the flow of messages when the local MS termination procedures of the present invention are implemented in a radio telecommunications network, and the local termination parameter is included in the Unsolicited Response Invoke message. The network includes the O-MSC 31, the HLR 32, the V-MSC 33 which borders the O-MSC, and the called MS 50. When a call directed toward the called MS originates in the O-MSC, the O-MSC sends a LOCREQ Invoke message 71 to the HLR 32 and includes the MIN of the called MS 50. The HLR sends a ROUTREQ Invoke message 72 to the V-MSC 33. The V-MSC pages for the called MS at 73, but the MS responds with an unsolicited response to the bordering O-MSC at 74.
At 75, the O-MSC determines whether or not it was the MSC which originated the call. If not, the O-MSC sends an Unsolicited Response Invoke message 76 to the V-MSC and includes a TLDN. The V-MSC sends a ROUTREQ Return Result message 77 to the HLR, and the HLR sends a LOCREQ Return Result message 78 to the O-MSC with the TLDN. However, if the O-MSC determines at 75 that it is also the originating MSC, then the O-MSC sends an Unsolicited Response Invoke message 79 to the V-MSC and includes the local termination parameter. The V-MSC sends a ROUTREQ Return Result message 81 to the HLR, and the HLR sends a LOCREQ Return Result message 82 to the O-MSC with the local termination parameter. The O-MSC then routes the call locally at 83.
It is thus believed that the operation and construction of the present invention will be apparent from the foregoing description. While the method shown and described has been characterized as being preferred, it will be readily apparent that various changes and modifications could be made therein without departing from the spirit and scope of the invention as defined in the following claims.

Claims

-9-WHAT IS CLAIMED IS:
1. In a radio telecommunications network having an originating mobile switching center (O-MSC) where a call originates, a home location register (HLR) which includes location information for a called mobile station (MS), and a serving MSC where the called MS is located, a method of performing local termination of the call when the called MS is located in the O-MSC, said method comprising the steps of: sending a routing request message from the HLR to the serving MSC, said routing request message including an identification of the O-MSC; determining in the serving MSC whether the serving MSC is also the O-MSC; and routing the call locally in the O-MSC upon determining that the serving MSC is also the O-MSC.
2. The method of performing local termination of claim 1 further comprising, after the step of determining in the serving MSC whether the serving MSC is also the O-MSC, the steps of: sending a routing request return result message from the serving MSC to the HLR upon determining that the serving MSC is also the O-MSC, said routing request return result message including a local routing number; and sending a location request return result message from the HLR to the O-MSC with the local routing number.
3. The method of performing local termination of claim 1 further comprising, before the step of sending a routing request message from the HLR to the serving MSC, the steps of: sending a location request message from the O-MSC to the HLR requesting location information for the called MS; determining in the HLR whether the called MS is located in the O-MSC; determining in the HLR whether the O-MSC can handle a local termination parameter upon determining that the called MS is located in the O-MSC, said local termination parameter triggering the O-MSC to route the call locally; and -10- sending a location request return result message from the HLR to the O-MSC upon determining that the O-MSC can handle the local termination parameter, said location request return result message including the local termination parameter.
4. In a radio telecommunications network having an originating mobile switching center (O-MSC) where a call originates, a home location register (HLR) which includes location information for a called mobile station (MS), and a serving MSC where the called MS is located, a method of performing local termination of the call when the called MS is located in the O-MSC, said method comprising the steps of: sending a location request message from the O-MSC to the HLR requesting location information for the called MS; determining in the HLR whether the called MS is located in the O-MSC; determining in the HLR whether the O-MSC can handle a local termination parameter upon determining that the called MS is located in the O-MSC, said local termination parameter triggering the O-MSC to route the call locally; sending a location request return result message from the HLR to the O-MSC upon determining that the O-MSC can handle the local termination parameter, said location request return result message including the local termination parameter; routing the call locally in the O-MSC upon receiving the local termination parameter; determining in the HLR whether the O-MSC supports IS-41C, upon determimng that the O-MSC cannot handle the local termination parameter; sending a location request return result message from the HLR to the O-MSC with a DMH Redirection Indicator parameter which instructs the O-MSC to handle the call as a local termination, upon determining that the O-MSC supports IS-41C; sending a routing request invoke message from the HLR to the serving MSC upon determimng that the O-MSC does not support IS-41C, said routing request invoke message including an identification of the O-MSC; determining in the serving MSC whether the serving MSC is also the O-MSC; sending a routing request return result message from the serving MSC to the HLR upon determining that the serving MSC is also the O-MSC, said routing request -11- return result message including a local routing number; sending a location request return result message from the HLR to the O-MSC with the local routing number; and routing the call locally in the O-MSC utilizing the local routing number.
5. A method of performing local termination of a call in a radio telecommunications network, said network having an originating mobile switching center (O-MSC) where the call originates, a home location register (HLR) which includes location information for a called mobile station (MS), a visited MSC (V- MSC) bordering the O-MSC where the called MS was last located, and a paging area which extends across a border between the O-MSC and the V-MSC, said method comprising the steps of: receiving a routing request message in the V-MSC requesting routing information for the called MS; sending an intersystem page message from the V-MSC to the O-MSC directing the O-MSC to page for the called MS in the paging area; paging for the called MS in the paging area by the O-MSC and the V-MSC; sending a page response from the called MS to the O-MSC; determining in the O-MSC that the called MS is responding to a call that originated in the O-MSC; and routing the call locally in the O-MSC to the called MS.
6. The method of performing local termination of claim 5 further comprising, after the step of determining in the O-MSC that the called MS is responding to a call that originated in the O-MSC, the steps of: sending an intersystem page return result message from the O-MSC to the V- MSC, said intersystem page return result message including a local termination parameter; and returning the local termination parameter to the O-MSC, the local termination parameter triggering the O-MSC to route the call locally to the called MS.
7. A method of performing local termination of a call in a radio -12- telecommunications network, said network having an originating mobile switching center (O-MSC) where the call originates, a home location register (HLR) which includes location information for a called mobile station (MS), and a visited MSC (V- MSC) bordering the O-MSC where the called MS was last located, said method comprising the steps of: receiving a routing request message in the V-MSC requesting routing information for the called MS; paging for the called MS by the V-MSC; receiving an unsolicited page response from the called MS in the O-MSC; determining in the O-MSC that the called MS is responding to a call that originated in the O-MSC; and routing the call locally in the O-MSC to the called MS.
8. The method of performing local termination of claim 7 further comprising, after the step of determining in the O-MSC that the called MS is responding to a call that originated in the O-MSC, the steps of: sending an unsolicited response message from the O-MSC to the V-MSC, said unsolicited response message including a local termination parameter; and returning the local termination parameter to the O-MSC, the local termination parameter triggering the O-MSC to route the call locally to the called MS.
PCT/SE1999/000489 1998-04-14 1999-03-26 Local call termination handling in a radio telecommunications network WO1999053711A1 (en)

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