Patent ID: 8917589

Claim:
A Packet Data Protocol (PDP) context handling method for a Mobile Station (MS) with a PDP context for an emergency bearer service, wherein a radio access bearer (RAB) associated with the PDP context is released by a network, the PDP context handling method comprising: downgrading, by the MS, a maximum uplink bit rate and a maximum downlink bit rate associated with the PDP context from original non-zero positive values to a zero value; sending a request signal associated with a modification of the maximum uplink bit rate and the maximum downlink bit rate by the MS; when the request signal corresponds to a first PDP context modification message, re-establishing the RAB associated with the PDP context for the emergency bearer service, the step of re-establishing further comprising: receiving a response message indicating that the first PDP context modification procedure initiated by the first PDP context message has failed to modify the maximum uplink bit rate and the maximum downlink bit rate as the original non-zero positive values; sending a PDP context deactivation signal to deactivate the PDP context; receiving a response message indicating that a PDP context deactivation procedure initiated by the PDP context deactivation signal has been successfully performed; sending a PDP context activation signal to re-activate the PDP context with the original non-zero positive values as the maximum uplink bit rate and the maximum downlink bit rate; sending a service request message by the MS to initiate a service request procedure; receiving a confirmation message indicating that the service request procedure to re-establish the RAB associated with the re-activated PDP context has been performed; and performing data exchange using the re-established RAB associated with the PDP context for the emergency bearer service.