Method and apparatus for providing emergency service in a network
A method, for a UE in a network, for requesting an emergency service is disclosed. The method comprises: when an emergency service is required, if the UE is using CP CIoT optimization, transmitting a NAS message including an indication that an emergency service is requested. The NAS message may be a CPSR message, and the indication may be a predetermined value (e.g. denoting “emergency service”) in a predetermined field (e.g. Control plane service type field) of the message. Alternatively, the NAS message may be a Service Request message, the indication may be a predetermined value (e.g. denoting “emergency service” or “emergency service fallback”) in a predetermined field (e.g. Service type field) of the message, and transmitting the Service Request message may be prioritised over transmitting a message (e.g. CPSR message) for sending data (e.g. not related to an emergency service).
1 . A method performed by a user equipment (UE) in a 5G system (5GS) network, for a service request procedure, the method comprising:
determining that the UE is using control plane (CP) cellular internet of things (CIoT) 5GS optimization; and
transmitting, to a network, a control plane service request (CPSR) message including control plane service type information set to emergency services and an uplink data status information element (IE) to indicate a protocol data unit (PDU) session for an emergency service,
wherein the uplink data status in the CPSR message indicates the PDU session that has user data to be transmitted via user-plane resources by setting a bit corresponding to a PDU session identity of the PDU session to a first value.
2 . The method of claim 1 , further comprising:
in case that the emergency service is not supported by the 5GS network, transmitting a CPSR message including control plane service type information set to emergency services fallback.
3 . The method of claim 2 ,
wherein, in case that the UE does not have any PDU session used for control plane only, the control plane service type information set to emergency services fallback is included in the CPSR message.
4 . The method of claim 1 , further comprising transitioning from the 5GMM-IDLE mode to a 5GMM-CONNECTED mode.
5 . The method of claim 1 , further comprising:
requesting establishment of user plane resources for the PDU session for the emergency service using the CPSR message including the control plane service type information set to emergency services and the uplink data status IE indicating that the PDU session has the user data to be transmitted.
6 . The method of claim 1 , wherein the UE is operating in an N 1 mode.
7 . A user equipment (UE) in a 5G system (5GS) network, for a service request procedure, the UE comprising:
a transceiver; and
a processor configured to:
determine that the UE is using control plane (CP) cellular internet of things (CIoT) 5GS optimization, and
transmit, to a network, a control plane service request (CPSR) message including control plane service type information set to emergency services and an uplink data status information element (IE) to indicate a protocol data unit (PDU) session for an emergency service,
wherein the uplink data status in the CPSR message indicates the PDU session that has the user data to be transmitted via user-plane resources by setting a bit corresponding to a PDU session identity of the PDU session to a first value.
8 . The UE of claim 7 , wherein the processor is further configured to:
in case that the emergency service is not supported by the 5GS network, transmit a CPSR message including control plane service type information set to emergency services fallback.
9 . The UE of claim 8 ,
in case that the UE does not have any PDU session used for control plane only, the control plane service type information set to emergency services fallback is included in the CPSR message.
10 . The UE of claim 7 , wherein the processor is further configured to transition from the 5 GMM-IDLE mode to a 5GMM-CONNECTED mode.
11 . The UE of claim 7 , wherein the processor is further configured to request establishment of user plane resources for the PDU session for the emergency service using the CPSR message including the control plane service type information set to emergency services and the uplink data status IE indicating that the PDU session has the user data to be transmitted.
12 . The UE of claim 7 , wherein the UE is operating in an N1 mode.