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| Interface apparatus for communication terminal equipment units |
| It is an object of the present invention to provide an interface apparatus which is capable of ... |
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| Telephonic voice message transmission control method |
| An object of the present invention is, therefore, to provide a method of controlling transmission ... |
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| Process for analyzing traffic localization within a cellular radiocommunication network |
| The invention thus proposes a process for analysing the localization of the traffic supported by a ... |
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| Leaving a message on a held connection |
| FIG. 1 is a system diagram illustrating the operation of applicants' invention in a number of its ... |
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| Communication device for placing calls within a plurality of wireless communication networks |
| OF THE PREFERRED EMBODIMENT In one aspect, the present invention relates to a communication device ... |
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| Character string input system |
| Therefore, it is a first object of the present invention to provide a character string input system ... |
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| Facsimile apparatus and method for use with customer switching system |
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Distributed signaling message routing in a scalable wireless communication system
| Details |
Inventors: Ho, Joseph S. M.; Nguyen, Nhut; Ernam, Hakan;
Assignee: Nortel Networks LTD (St. Laurent, CA)
Primary Examiner: Chin; Vivian
Assistant Examiner: Moore; J
Attorney, Agent or Firm: Garlick; Bruce E.
A wireless communication system constructed according to the present invention assigns each serviced mobile unit to a serving mobile switching center to minimize mobility management overhead and to equalize loading among a plurality of mobile switching centers. The wireless communication system includes the plurality of mobile switching centers and a base station system which includes a plurality of base station controllers, each of which couples to a plurality of base stations. A plurality of mobile units served by the system are assigned to the mobile switching centers so that loading is equalized. In one particular construction of the wireless communication system, a dispatching switch couples the base station system to the plurality of mobile switching centers and performs the assignments of the mobile units. In an example of operation, upon attachment of a mobile unit, the dispatching switch determines loading of each of the mobile switching centers. Then, based upon the loading, the dispatching switch assigns the mobile unit to one of the mobile switching centers, the "serving" mobile switching center. |
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DETAILED DESCRIPTION In order to overcome the described shortcomings of prior wireless communication systems, among other shortcomings, a wireless communication system constructed according to the present invention assigns each mobile unit to a serving mobile switching center among a plurality of mobile switching centers to equalize loading on the mobile switching centers.
The wireless communication system includes the plurality of mobile switching centers and a base station system which includes a plurality of base station controllers, each of which couples to a plurality of base stations.
To minimize mobility overhead, each mobile unit is served only by its serving mobile switching center.
Signaling messages required to service a particular mobile unit are routed to its serving mobile switching center by utilizing the mobile unit's temporary identification number.
Since no inter-mobile switching center hand-off and location updating are required, mobility overhead is significantly reduced.
Also, assignment of mobile units to mobile switching centers can be performed in such a manner to equalize loading among the plurality of base stations.
In one particular construction of the wireless communication system, a message router couples the base station system to the plurality of mobile switching centers for purposes of signaling message routing and, in some cases, for the purpose of assigning mobile units to mobile switching centers.
In an example of operation, upon attachment of a mobile unit to the system, the message router determines the loading on each of the mobile switching centers.
Based upon the loading, the message router assigns the mobile unit to one of the mobile switching centers, the "serving" mobile switching center.
The serving mobile switching center then assigns a temporary identification number (temporary ID) to the mobile unit that identifies itself as the serving mobile switching center.
The temporary ID also uniquely identifies the mobile unit.
The mobile unit stores the temporary ID in its local memory and uses the temporary ID to identify itself in future signaling connections
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