| 摘要 |
A cellular communications system is provided in which a user device sends a Service Request to a Mobility Management Entity together with parameter data that depends on the service that is requested. The Mobility Management Entity then determines from the parameter value if AS security is required to provide the requested service. If it is not, then the Mobility Management Entity accepts the Request without providing security parameters for establishing another signalling radio bearer so that an existing signalling radio bearer is used to provide the requested service. If it is, then the Mobility Management Entity accepts the Request and provides security parameters for establishing another signalling radio bearer to be used in providing the requested service.
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