Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2000-06-06
2003-12-30
Appiah, Charles (Department: 2682)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S518000
Reexamination Certificate
active
06671515
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to wireless communication systems, and more particularly, to a method and an apparatus for selecting communication cells in a wireless communication system having a mobile station.
BACKGROUND OF THE INVENTION
A cellular communication system is a complex network of systems and elements. Typical elements include (1) a radio link to the mobile stations (cellular telephones), which is usually provided by at least one and typically several base stations, (2) communication links between the base stations, (3) a controller, typically one or more base station controllers or centralized base station controllers (BSC/CBSC), to control communication between and to manage the operation and interaction of the base stations, (4) a call controller or switch, typically a mobile switching center (MSC), for routing calls within the system, and (5) a link to the land line or public switch telephone system (PSTN), which is usually also provided by the MSC.
One aspect of a wireless communication system such as, but not limited to, a code division multiple access (CDMA) based communication system, is to transmit messages between the network elements of the system and remote or mobile stations operating within the system. At times, it may be desirable to transmit a message to a group of mobile stations.
The presence of mobile stations within communication cells may be determined to minimize the number of base stations involved in a group message by transmitting a message such as a broadcast paging message to the mobile stations. The mobile stations may respond to the message thus identifying the base stations of communication cells containing mobile stations of the group. This Agroup message≡ may be sent by using what is often referred to as a dispatch call, which is a call that is directed to each mobile station of the group. To ensure all mobile stations of the group receive the dispatch call, one method would be to send the message in each communication cell of the communication system. This arrangement, however, may inefficiently use communication resources, such as when there are no mobile stations that are associated with a group located within a communication cell. A communication resource is still assigned for that communication cell, and that assignment of a communication resource is an inefficient use. The message may instead be sent out to those communication cells containing group members if paging is done at each communication cell to locate the group members.
However, attempts to respond to the page message by multiple mobile stations in an uncoordinated fashion and without power control would result in interference to other calls in the communication system. Current CDMA systems allow mobile stations receiving a phone call to respond to broadcast paging messages on a CDMA control channel. However, the current CDMA systems only allow one mobile station to respond because paging responses from multiple mobile stations on a CDMA control channel would likely collide, and therefore, results in retries and delayed responses. Furthermore, the current CDMA systems use tight power control to overcome the interference caused by each mobile station. This generally requires that users accessing the system initially perform an access probe procedure, in which the page response would be sent multiple times at increasing power levels until a response is heard by the base station. However, this can result in a significant delay in responding.
Therefore, a need exists for a method and an apparatus that selects the communication cells in a wireless communication system having a mobile station to which a dispatch call is directed without delay or interference to other calls.
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Chinitz Leigh
Needham Michael J.
Wilson Timothy J.
Appiah Charles
Jacobs Jeffrey K.
Motorola Inc.
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