System for reducing paging channel occupancy for message waiting indication in mobile switching centers
View Patent ↗In order to reduce the traffic on the paging channel, the system for reducing paging channel occupancy for message waiting indication in mobile switching centers allows the Message Waiting Notification process to determine a last zone in which the Mobile Subscriber was located and only transmit the Message Waiting Indication to the cells within that zone. This eliminates message transmission on the paging channel of cells which are not likely to have the Mobile Subscriber Station residing in their service area. Multiple retries can be attempted and if the last retry is being activated, the paging can be extended to cover all zones in the Mobile Switching Center. The sharing of information about when a mobile has responded to a message waiting count between the Serving MSC and the Home MSC also reduces the paging channel occupancy. The method of not sending a message waiting notification when a mobile has already acknowledged the message count greatly reduces the impact of Message Waiting Notification on the paging channel occupancy. In particular, border cell areas where the Mobile Subscriber Station can bounce between MSCs is where the biggest benefit can be derived.
1. A message waiting indication system, operable in a cellular communication network, for maintaining a count of the messages stored for a subscriber who uses a mobile subscriber station served by said cellular communication network, comprising:
voice mail means, located in said cellular communication network, for storing voice mail messages for subscribers served by said cellular communication network;
message waiting indication means, located in said cellular communication network, comprising:
subscriber profile means for storing, in a Home Location Register that serves said mobile subscriber station, data indicative of a present count of voice mail messages stored in said voice mail means for said subscriber's mobile subscriber station;
subscriber acknowledgement means for storing data, in said Home Location Register that serves said mobile subscriber station, indicative of a present count of acknowledged voice mail messages stored in said voice mail means for said subscriber's mobile subscriber station; and
message notification means, responsive to the presence of voice mail messages not inclusive of those identified in said present count of acknowledged voice mail messages for said subscriber's mobile subscriber station, for transmitting data to said subscriber's mobile subscriber station indicative of said count, comprising:
location means for identifying a present predefined paging zone of a serving Mobile Switching Center in said cellular communication network in which said subscriber's mobile subscriber station was last located,
paging means for activating paging of said subscriber's mobile subscriber station via a paging channel of said cellular communication network exclusively in all cells of said identified predefined paging zone of said cellular communication network, and
Home Location Register update means, responsive to said subscriber's mobile subscriber station acknowledging receipt of said data to said subscriber's mobile subscriber station indicative of said count, for transmitting said acknowledgement to said subscriber's Home Location Register.
2. The message waiting indication system of claim 1 wherein said message notification means further comprises:
termination means, responsive to a failure to identify a present predefined paging zone of a serving Mobile Switching Center in which said subscriber's mobile subscriber station is located, for terminating paging of said subscriber's mobile subscriber station.
3. The message waiting indication system of claim 1 wherein said message notification means further comprises:
repetition means, responsive to identifying a present predefined paging zone of a serving Mobile Switching Center in which said subscriber's mobile subscriber station is located, for activating paging of said subscriber's mobile subscriber station in said predefined paging zone of a serving Mobile Switching Center up to a predetermined number of times until said subscriber's mobile subscriber station is located.
4. The message waiting indication system of claim 3 wherein said message notification means further comprises:
means, responsive to said paging of said subscriber's mobile subscriber station failing to reach said subscriber's mobile subscriber station in said predetermined number of times, for paging said subscriber's mobile subscriber station in all of said cells in said present serving Mobile Switching Center.
5. The message waiting indication system of claim 1 wherein said paging means comprises:
mapping means for identifying a last location where said subscriber's mobile subscriber station was located and at least one location within a predetermined distance from said last location.
6. The message waiting indication system of claim 5 wherein said aging means further comprises:
mapping means for identifying a last location where said subscriber's mobile subscriber station was located and at least one location from a look up table to identify locations within a predetermined distance from said last location.
7. The message waiting indication system of claim 5 wherein said message notification means further comprises:
repetition means, responsive to identifying said last location where said subscriber's mobile subscriber station was located and at least one location within a predetermined distance from said last location, for activating paging of said subscriber's mobile subscriber station in said last location where said subscriber's mobile subscriber station was located and at least one location within a predetermined distance from said last location until said subscriber's mobile subscriber station is located.
8. The message waiting indication system of claim 5 wherein said message notification means further comprises:
repetition means, responsive to identifying said last location where said subscriber's mobile subscriber station was located and at least one location within a predetermined distance from said last location, for activating paging of said subscriber's mobile subscriber station in said last location where said subscriber's mobile subscriber station was located until said subscriber's mobile subscriber station is located.
9. The message waiting indication system of claim 1 wherein said cellular communication network comprises at least one cell site, said location means comprises:
location data update means, responsive to location data received from said cellular communication network, for recording present location data identifying one of said at least one cell site which presently serves said subscriber's mobile subscriber station.
10. A method of operating a message waiting indication system, located in a cellular communication network, for maintaining a count of the messages stored for a subscriber who uses a mobile subscriber station served by said cellular communication network, comprising:
storing, in a Home Location Register that serves said mobile subscriber station, voice mail messages in a voice mail system, located in said cellular communication network, for subscribers served by said cellular communication network;
storing, in a Home Location Register that serves said mobile subscriber station, data indicative of a present count of voice mail messages stored in said voice mail system for said subscriber's mobile subscriber station;
storing data indicative of a present count of acknowledged voice mail messages stored in said voice mail system for said subscriber's mobile subscriber station; and
transmitting, in response to the presence of voice mail messages not inclusive of those identified in said present count of acknowledged voice mail messages for said subscriber's mobile subscriber station, data to said subscriber's mobile subscriber station indicative of said count, comprising:
identifying a present predefined paging zone of a serving Mobile Switching Center in said cellular communication network in which said subscriber's mobile subscriber station was last located,
activating paging of said subscriber's mobile subscriber station via a paging channel of said cellular communication network exclusively in all cells of said identified predefined paging zone of said cellular communication network, and
transmitting, in response to said subscriber's mobile subscriber station acknowledging receipt of said data to said subscriber's mobile subscriber station indicative of said count, said acknowledgement to said subscriber's Home Location Register.
11. The method of operating a message waiting indication system of claim 10 wherein said step of transmitting further comprises:
terminating, in response to a failure to identify a present predefined paging zone of a serving Mobile Switching Center in which said subscriber's mobile subscriber station is located, for terminating paging of said subscriber's mobile subscriber station.
12. The method of operating a message waiting indication system of claim 10 wherein said step of transmitting further comprises:
activating, in response to identifying a present predefined paging zone of a serving Mobile Switching Center in which said subscriber's mobile subscriber station is located, paging of said subscriber's mobile subscriber station in said predefined paging zone of a serving Mobile Switching Center up to a predetermined number of times until said subscriber's mobile subscriber station is located.
13. The method of operating a message waiting indication system of claim 12 wherein said step of transmitting further comprises:
paging, in response to said paging of said subscriber's mobile subscriber station failing to reach said subscriber's mobile subscriber station in said predetermined number of times, said subscriber's mobile subscriber station in all of said cells in said present serving Mobile Switching Center.
14. The method of operating a message waiting indication system of claim 10 wherein said step of paging comprises:
identifying a last location where said subscriber's mobile subscriber station was located and at least one location within a predetermined distance from said last location.
15. The method of operating a message waiting indication system of claim 14 wherein said step of paging further comprises:
identifying a last location where said subscriber's mobile subscriber station was located and at least one location from a look-up table to identify locations within a predetermined distance from said last location.
16. The method of operating a message waiting indication system of claim 14 wherein said step of transmitting further comprises:
activating, in response to identifying said last location where said subscriber's mobile subscriber station was located and at least one location within a predetermined distance from said last location, paging of said subscriber's mobile subscriber station in said last location where said subscriber's mobile subscriber station was located and at least one location within a predetermined distance from said last location until said subscriber's mobile subscriber station is located.
17. The method of operating a message waiting indication system of claim 14 wherein said step of transmitting further comprises:
activating, in response to identifying said last location where said subscriber's mobile subscriber station was located and at least one location within a predetermined distance from said last location, paging of said subscriber's mobile subscriber station in said last location where said subscriber's mobile subscriber station was located until said subscriber's mobile subscriber station is located.
18. The method of operating a message waiting indication system of claim 10 wherein said cellular communication network comprises at least one cell site, said step of identifying comprises:
recording, in response to location data received from said cellular communication network, present location data identifying a one of said at least one cell site which presently serves said subscriber's mobile subscriber station.