Method and system for reducing call setup by roaming number caching
First Claim
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1. A method for reducing call setup cost for mobile communications networks comprising the steps of:
- determining if a mobile subscriber integrated services digital network number with a bearer capability requirement of a call is located in a cache register of a gateway mobile switching center when receiving said call, said gateway mobile switching center having pre-assigned mobile subscriber roaming numbers with associated bearer capability stored in said cache;
responsive to said determination, sending an initial address message directly from said gateway mobile switching center generated from said mobile subscriber roaming number to a visiting mobile switching center to set up a trunk connection for said call;
designating a “
Class One”
mobile subscriber roaming number, for a “
Class One”
mobile terminal having one of a “
K”
highest said call arrival rates during a specified observation period and all else designated as a “
Class Two”
mobile terminal, wherein said gateway mobile switching center will only set up a cache record for calls for mobile terminals that are assigned a “
Class One”
mobile subscriber roaming number.
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Abstract
A method and system for improving overall system capacity in GSM networks by reducing the number of home location register and visitor location register queries is disclosed. The method and system allows the reuse of the MSRN by allocating the MSRN to a mobile terminal and using it for future calls. The method of the present invention allows the GMSC to cache the MSRN for a called mobile terminal. During a first call setup, an entry is recorded at a cache register that maps the Mobile Subscriber ISDN Number (MSISDN) of the mobile terminal to a previously allocated MSRN. Additionally, the Bearer Capability (BC) associated with this MSRN is also recorded in the cache register. When the next call arrives, the GMSC first checks if a MSRN for that called mobile terminal already exists in its cache register. If a cached MSRN is available and the BC associated with the cached MSRN matches the BC requested by the current call, then the GMSC uses the cached MSRN to route the call to the VMSC. The method and system of the present invention makes it unnecessary to query the HLR and VLR when a land-to-mobile call arrives thereby increasing network capacity while reducing processing load.
38 Citations
19 Claims
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1. A method for reducing call setup cost for mobile communications networks comprising the steps of:
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determining if a mobile subscriber integrated services digital network number with a bearer capability requirement of a call is located in a cache register of a gateway mobile switching center when receiving said call, said gateway mobile switching center having pre-assigned mobile subscriber roaming numbers with associated bearer capability stored in said cache;
responsive to said determination, sending an initial address message directly from said gateway mobile switching center generated from said mobile subscriber roaming number to a visiting mobile switching center to set up a trunk connection for said call;
designating a “
Class One”
mobile subscriber roaming number, for a “
Class One”
mobile terminal having one of a “
K”
highest said call arrival rates during a specified observation period and all else designated as a “
Class Two”
mobile terminal, wherein said gateway mobile switching center will only set up a cache record for calls for mobile terminals that are assigned a “
Class One”
mobile subscriber roaming number.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
sending a send routing information message from said gateway mobile switching center to a home location register requesting a mobile subscriber roaming number for a visiting mobile switching center.
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3. The method for reducing call setup cost for mobile communications networks according to claim 2 wherein the step of sending said send routing information message further comprises the step of:
sending a provide roaming number message to said visiting mobile switching center from said home location register using an international mobile subscriber identity number as a terminal ID looked up at said home location register.
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4. The method for reducing call setup cost for mobile communications networks according to claim 3 wherein the step of sending said provide roaming number message further comprises the step of:
assigning a mobile subscriber roaming number and associated bearer capability and updating a record at said visiting mobile switching center for said mobile terminal.
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5. The method for reducing call setup cost for mobile communications networks according to claim 4 wherein the step of assigning said mobile subscriber roaming number and associated bearer capability further comprises the step of:
sending said mobile subscriber roaming number and associated bearer capability to said home location register through a provide roaming number acknowledgement message.
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6. The method for reducing call setup cost for mobile communications networks according to claim 5 wherein the step of assigning said mobile subscriber roaming number and associated bearer capability further comprises the step of:
recording said mobile subscriber roaming number and associated bearer capability at said home location register.
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7. The method for reducing call setup cost for mobile communications networks according to claim 6 wherein the step of recording said mobile subscriber roaming number and associated bearer capability further comprises the step of:
forwarding said mobile subscriber roaming number and associated bearer capability from said home location register to said gateway mobile switching center through a send routing information acknowledgement message.
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8. The method for reducing call setup cost for mobile communications networks according to claim 7 wherein the step of recording said mobile subscriber roaming number and associated bearer capability further comprises the step of:
recording said mobile subscriber integrated services digital network number, said mobile subscriber roaming number and said associated bearer capability in said cache register of said gateway mobile switching center for future calls wherein said gateway mobile switching center sets up a connection to said visiting mobile switching center using said initial address message.
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9. The method for reducing call setup cost for mobile communications networks according to claim 8 wherein the step determining if said mobile subscriber roaming number and associated bearer capability of said called mobile terminal are located in said cache register of said gateway mobile switching center further comprises the step of:
deleting said mobile subscriber roaming number and associated bearer capability in said cache register at said gateway mobile switching center and said home location register when said mobile terminal moves to a different visiting mobile switching center.
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10. An information handling system for reducing call setup cost for mobile communications networks, comprising:
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means for determining if a mobile subscriber integrated services digital network number with a bearer capability requirement of a call is located in a cache register of a gateway mobile switching center when receiving said call, said gateway mobile switching center having pre-assigned mobile subscriber roaming numbers with associated bearer capability stored in said cache;
responsive to said determination, means for sending an initial address message directly from said gateway mobile switching center generated from said mobile subscriber roaming number to a visiting mobile switching center to set up a trunk connection for said call; and
means for designating a “
Class One”
mobile subscriber roaming number, for a “
Class One”
mobile terminal having one of a “
K”
highest said call arrival rates during a specified observation period and all else designated as a “
Class Two”
mobile terminal, wherein said gateway mobile switching center will only set up a cache record for calls for mobile terminals that are assigned a “
Class One”
mobile subscriber roaming number.- View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
means for sending a send routing information message from said gateway mobile switching center to a home location register requesting a mobile subscriber roaming number for a visiting mobile switching center.
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12. An information handling system for reducing call setup cost for mobile communications networks according to claim 11 wherein said means for sending said send routing information message further comprises:
means for sending a provide roaming number message to said visiting mobile switching center from said home location register using an international mobile subscriber identity number as a terminal ID looked up at said home location register.
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13. An information handling system for reducing call setup cost for mobile communications networks according to claim 12 wherein said means for sending said provide roaming number message further comprises:
means for assigning a mobile subscriber roaming number and associated bearer capability and updating a record at said visiting mobile switching center for said mobile terminal.
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14. An information handling system for reducing call setup cost for mobile communications networks according to claim 13 wherein means for assigning said mobile subscriber roaming number and associated bearer capability further comprises:
means for sending said mobile subscriber roaming number and associated bearer capability to said home location register through a provide roaming number acknowledgement message.
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15. An information handling system for reducing call setup cost for mobile communications networks according to claim 14 wherein means for assigning said mobile subscriber roaming number and associated bearer capability further comprises:
means for recording said mobile subscriber roaming number and associated bearer capability at said home location register.
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16. An information handling system for reducing call setup cost for mobile communications networks according to claim 15 wherein means for recording said mobile subscriber roaming number and associated bearer capability further comprises:
means for forwarding said mobile subscriber roaming number and associated bearer capability from said home location register to said gateway mobile switching center through a send routing information acknowledgement message.
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17. An information handling system for reducing call setup cost for mobile communications networks according to claim 16 wherein means for recording said mobile subscriber roaming number and associated bearer capability further comprises:
means for recording said mobile subscriber integrated services digital network number, said mobile subscriber roaming number and said associated bearer capability in said cache register of said gateway mobile switching center for future calls wherein said gateway mobile switching center sets up a connection to said visiting mobile switching center using said initial address message.
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18. An information handling system for reducing call setup cost for mobile communications networks according to claim 17 wherein means for determining if said mobile subscriber roaming number and associated bearer capability of said called mobile terminal are located in said cache register of said gateway mobile switching center further comprises:
means for deleting said mobile subscriber roaming number and associated bearer capability in said cache register at said gateway mobile switching center and said home location register when said mobile terminal moves to a different visiting mobile switching center.
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19. A computer program product residing on computer usable medium for reducing call setup cost for mobile communications networks, comprising:
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instruction means for determining if a mobile subscriber integrated services digital network number with a bearer capability requirement of a call is located in a cache register of a gateway mobile switching center when receiving said call, said gateway mobile switching center having pre-assigned mobile subscriber roaming numbers with associated bearer capability stored in said cache;
responsive to said determination, instruction means for sending an initial address message directly from said gateway mobile switching center generated from said mobile subscriber roaming number to a visiting mobile switching center to set up a trunk connection for said call; and
instruction means for designating a “
Class One”
mobile subscriber roaming number, for a “
Class One”
mobile terminal having one of a “
K”
highest said call arrival rates during a specified observation period and all else designated as a “
Class Two”
mobile terminal wherein said gateway mobile switching center will only set up a cache record for calls for mobile terminals that are assigned a “
Class One”
mobile subscriber roaming number.
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Specification
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Current AssigneeBlackberry Limited
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Original AssigneeNortel Networks Limited (Nortel Networks Corporation)
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InventorsHo, Joseph S. M., Xu, Jim
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Primary Examiner(s)Vo, Nguyen T.
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Assistant Examiner(s)Ramos-Feliciano, Eliseo
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Application NumberUS09/244,923Time in Patent Office1,230 DaysField of Search455/432, 455/433, 455/435, 455/414, 455/445, 455/560, 455/405US Class Current455/432.1CPC Class CodesH04W 8/02 Processing of mobility data...H04W 8/26 Network addressing or numbe...
