What is claimed is:1. A method for generating an emergency notification by a communication device, the method comprises:generating, in response to a detection of a request to generate the emergency notification, an attach request to a network management entity, the attach request carrying information indicating that an attachment is requested to a communication channel implementing Non-IP Data Delivery functionality and information representing that the attachment is requested for delivering an emergency notification,receiving a response to the attach request,in response to a detection that the response to the attach request indicates an acceptance of the attachment generating the emergency notification, andtransmitting the generated emergency notification over the communication channel implementing Non-IP Data Delivery functionality.2. The method of claim 1, wherein the method further comprises:in response to the detection that the response indicates the acceptance of the attachment communicating, by the communication device, with an external device for obtaining further data to be included in the emergency notification.3. The method of the claim 2, wherein obtained further data is at least one of the following: personal data relating to a user of the communication device; measurement data obtainable from at least one sensor.4. A non-transitory computer readable medium on which is stored a computer program for generating an emergency notification, which, when executed by at least one processor, cause a communication device to perform the method according to claim 3.5. A non-transitory computer readable medium on which is stored a computer program for generating an emergency notification, which, when executed by at least one processor, cause a communication device to perform the method according to claim 2.6. A non-transitory computer readable medium on which is stored a computer program for generating an emergency notification, which, when executed by at least one processor, cause a communication device to perform the method according to claim 1.7. A communication device for generating an emergency notification, the communication device comprising:at least one processor;at least one memory including computer program code;the at least one memory and the computer program code configured to, with the at least one processor, cause the communication device to perform:generate, in response to a detection of a request to generate the emergency notification, an attach request to a network management entity, the attach request carrying information indicating that an attachment is requested to a communication channel implementing Non-IP Data Delivery functionality and information representing that the attachment is requested for delivering an emergency notification,receive a response to the attach request,in response to a detection that the response to the attach request indicates an acceptance of the attachment generate the emergency notification, andtransmit the generated emergency notification over the communication channel implementing Non-IP Data Delivery functionality.8. The communication device of claim 7, wherein the communication device is further caused to perform:communicate, in response to the detection that the response indicates the acceptance of the attachment, with an external device for obtaining further data to be included in the emergency notification.9. The communication device of claim 8, wherein obtained further data is at least one of the following: personal data relating to a user of the communication device; measurement data obtainable from at least one sensor.10. A method for generating a signal indicating an emergency situation by a network management entity, the method comprises:receiving an attach request from a communication device,in response to a detection that the attach request carries information indicating that an attachment is requested to a communication channel implementing Non-IP Data Delivery functionality and information representing that the attachment is requested for delivering an emergency notification allocating a network node controlling the communication channel implementing Non-IP Data Delivery functionality to the attach request,in response to an allocation of the network node generating a response to the communication device indicating an acceptance of an attachment,receiving an emergency notification over the communication channel implementing Non-IP Data Delivery functionality, andgenerating a signal indicating the emergency situation to the network node allocated to the attach request to be delivered to an emergency service center.11. The method of claim 10, the method further comprises:in response to a receipt of the emergency notification detecting that the emergency notification carries further data to be transmitted to the emergency service center.12. The method of claim 11, the method further comprises:adding the further data in a signal for transmitting it from the network management entity to the network node.13. The method of claim 10, the method further comprises:in response to the detection that the attach request carries information representing that the attachment is requested for delivering an emergency notification setting an indication expressing a priority to a signal for causing the network node to operate in accordance with the emergency situation.14. A non-transitory computer-readable medium on which is stored a computer program for generating a signal indicating an emergency situation, which, when executed by at least one processor, cause a network management entity to perform the method according to claim 10.15. A network management entity for generating a signal indicating an emergency situation, the network management entity comprises:at least one processor;at least one memory including computer program code;the at least one memory and the computer program code configured to, with the at least one processor, cause the network management entity to perform:receive an attach request from a communication device,in response to a detection that the attach request carries information indicating that an attachment is requested to a communication channel implementing Non-IP Data Delivery functionality and information representing that the attachment is requested for delivering an emergency notification allocate a network node controlling the communication channel implementing Non-IP Data Delivery functionality to the attach request,in response to an allocation of the network node generate a response to the communication device indicating an acceptance of an attachment,receive an emergency notification over the communication channel implementing Non-IP Data Delivery functionality, andgenerate a signal indicating the emergency situation to the network node allocated to the attach request to be delivered to an emergency service center.16. The network management entity of claim 15, wherein the network management entity is further caused to perform:detect, in response to a receipt of the emergency notification, that the emergency notification carries further data to be transmitted to the emergency service center.17. The network management entity of claim 16, wherein the network management entity is further caused to perform:add the further data in a signal for transmitting it from the network management entity to the network node.18. The network management entity of claim 15, wherein the network management entity is further caused to perform:set, in response to the detection that the attach request carries information representing that the attachment is requested for delivering an emergency notification, an indication expressing a priority to a signal for causing the network node to operate in accordance with the emergency situation.19. A system, comprising:at least one communication device for generating an emergency notification, the communication device comprising:at least one processor;at least one memory including computer program code;the at least one memory and the computer program code configured to, with the at least one processor, cause the communication device to perform:generate, in response to a detection of a request to generate the emergency notification, an attach request to a network management entity, the attach request carrying information indicating that an attachment is requested to a communication channel implementing Non-IP Data Delivery functionality and information representing that the attachment is requested for delivering an emergency notification,receive a response to the attach request,in response to a detection that the response to the attach request indicates an acceptance of the attachment generate the emergency notification, andtransmit the generated emergency notification over the communication channel implementing Non-IP Data Delivery functionality,the network management entity of claim 15,a network node, andan emergency service center.20. The system of claim 19, wherein the network node is implemented, for establishing a Non-IP Data Delivery functionality, with one of the following:Service Capability Exposure Function, SCEF; orServing Gateway, SGW, and Packet Data Network Gateway, PGW.