| 摘要 |
A WCDMA communication system that can provide a smooth data transmission even in a case when the communication rate associated with a communication service requested by a user cannot be obtained due to a lack of resources. In such a case, only when a base station control station (2-1,2-2) can provide a service by use of a communication rate lower than the requested communication rate, instead of compulsorily setting to a lower alternative communication rate, the communication rate for actually effecting a data communication is adjusted between a switching center (1) and the base station control station (2-1,2-2). As a method of this, an indicator that shows whether the communication rate can be adjusted or not is provided in an RAB setting request to be transmitted from the switching center (1) to the base station control station (2-1,2-2). Only when the indicator shows that the communication rate can be adjusted, the base station control station (2-1,2-2) decides, in a case of a lack of resources, a communication rate lower than the requested communication rate, and transmits to the switching center (1) an RAB setting response with the decided communication rate included therein. According to this communication rate, a communication service for a user terminal (4) is commenced.
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