Deactivating existing bearer/context for emergency bearer establishment

Abstract

A method, user equipment and non-transitory computer readable memory for establishing an emergency service using a wireless network includes unilaterally deactivating, at the user equipment when the user equipment needs to establish an emergency service, at least one active context with the wireless network without deactivating at least one other active context. Thereafter directing to the wireless network, a request to establish the emergency service that identifies the emergency service and one or more contexts that remain active after the unilateral deactivation of the at least one active context by the user equipment, synchronizing, in response to and based on the request, current context status information of the user equipment with the wireless network, and then establishing the emergency service using the wireless network with which the active context was deactivated.

1 - 24 . (canceled) 
     
     
         25 . A method, comprising:
 deactivating a first active context with a wireless network, by a user equipment, while maintaining a second context as active, responsive to a request to establish an emergency service; and   transmitting a request to establish the emergency service to the wireless network, by the user equipment, the request identifying the emergency service and the active second context.   
     
     
         26 . The method of  claim 25 , further comprising establishing the emergency service, by the user equipment, using the wireless network with which the first context was deactivated. 
     
     
         27 . The method of  claim 25 , wherein deactivating the first active context is performed unilaterally. 
     
     
         28 . The method of  claim 25 , further comprising transmitting an emergency attach request to the wireless network, by the user equipment, responsive to the local deactivation clearing resources used for active packet domain communication. 
     
     
         29 . The method of  claim 25 , wherein deactivating the first active context further comprises transmitting a deactivation message to the wireless network explicitly indicating the first context as a deactivated context. 
     
     
         30 . The method of  claim 29 , wherein transmitting the deactivation message to the wireless network is performed subsequent to transmission of the request to the wireless network to establish the emergency service. 
     
     
         31 . The method of  claim 29 , wherein the request to establish the emergency service transmitted to the wireless network comprises a SERVICE REQUEST and the deactivation message transmitted to the wireless network comprises one of a PDN CONTEXT DEACTIVATION or a PDN DISCONNECT REQUEST including a cause indicator explicitly identifying the service as an emergency service. 
     
     
         32 . The method of  claim 31 , wherein the SERVICE REQUEST is an EXTENDED SERVICE REQUEST. 
     
     
         33 . The method according to  claim 25 , further comprising:
 establishing packet data network services with the second context for Internet protocol multimedia subsystem signaling;   establishing an emergency session with an Internet Protocol multimedia subsystem; and   activating a voice data context for the established emergency session.   
     
     
         34 . The method of  claim 25 , further comprising synchronizing current context status information of the user equipment with the wireless network. 
     
     
         35 . A system, comprising:
 circuitry configured to unilaterally deactivate a first active context with a wireless network while maintaining a second context as active, responsive to a request to establish an emergency service; and   a transmitter configured to transmit, to the wireless network, a request to establish the emergency service, the request identifying the emergency service and the active second context.   
     
     
         36 . The system of  claim 35 , wherein the circuitry is further configured to establishing the emergency service using the wireless network with which the first context was deactivated. 
     
     
         37 . The system of  claim 35 , wherein the circuitry is configured to deactivate the first active context unilaterally. 
     
     
         38 . The system of  claim 35 , wherein the transmitter is further configured to transmit an emergency attach request to the wireless network, responsive to the local deactivation clearing resources used for active packet domain communication. 
     
     
         39 . The system of  claim 35 , wherein the transmitter is further configured to transmit a deactivation message to the wireless network explicitly indicating the first context as a deactivated context. 
     
     
         40 . The system of  claim 39 , wherein the transmitter is further configured to transmit the deactivation message subsequent to transmission of the request to the wireless network to establish the emergency service. 
     
     
         41 . The system of  claim 39 , wherein the transmitter is further configured to transmit, to the wireless network, a SERVICE REQUEST, and one of a PDN CONTEXT DEACTIVATION or a PDN DISCONNECT REQUEST including a cause indicator explicitly identifying the service as an emergency service. 
     
     
         42 . The system of  claim 41 , wherein the SERVICE REQUEST is an EXTENDED SERVICE REQUEST. 
     
     
         43 . The system of  claim 35 , wherein the circuitry is further configured for:
 establishing packet data network services with the second context for Internet protocol multimedia subsystem signaling;   establishing an emergency session with an Internet Protocol multimedia subsystem; and   activating a voice data context for the established emergency session.   
     
     
         44 . A non-transitory computer-readable storage medium comprising a set of computer-readable instructions stored thereon, which, when executed by a processing system, cause the processing system to perform the steps of:
 deactivating a first active context with a wireless network, by a user equipment, while maintaining a second context as active, responsive to a request to establish an emergency service; and   transmitting a request to establish the emergency service to the wireless network, by the user equipment, the request identifying the emergency service and the active second context.