Method of handling emergency session and related communication device

#1. Field of the Invention

#The application relates to a method and a related communication device used in a wireless communication system and related communication device, and more particularly, to a method of handling emergency session and a related communication device in a wireless communication system.

#2. Description of the Prior Art

#FIG. 1 is a schematic diagram of an exemplary wireless communication system.

#FIG. 2 is a schematic diagram of an exemplary communication device.

#FIG. 3 is a flow chart of an exemplary process.

#Please refer to FIG. 1, which illustrates a schematic diagram of an exemplary wireless communication system 10. Briefly, the wireless communication system 10 is composed of a network and a plurality of mobile devices. The wireless communication system 10 can be a GPS (General Packet Radio Service) system, or any other similar network system supporting packet switched services such as UMTS (Universal Mobile Telecommunications System), an LTE (long-term evolution), LTE-Advance system. In GPRS system, the network is referred as a Universal Terrestrial Radio Access Network (UTRAN) comprising and a plurality of NBs (Node Bs). GPRS enables data transfers through cellular networks. It is used for mobile internet, MMS and other data communications. In theory the speed limit of GPRS is 115 kbps, but in most networks it is around 35 kbps. The mobile device is referred as to a user equipment (UEs) or a mobile station (MS) supporting the abovementioned RATs and may be a device such as mobile phones, computer systems, etc. This terminology will be used throughout the application for ease of reference, however, this should not be construed as limiting the disclosure to any one particular type of network. In some examples, the network and the UE may be seen as a transmitter or receiver according to transmission direction, e.g., for uplink (UL), the UE is the transmitter and the network is the receiver, and for downlink (DL), the network is the transmitter and the UE is the receiver.

#Please refer to FIG. 2, which illustrates a schematic diagram of an exemplary communication device 20. The communication device 20 may be the mobile devices or the network shown in FIG. 1 and may include a processor 200 such as a microprocessor or ASIC, a memory unit 210 and a communication interfacing unit 220. The memory unit 210 may be any data storage device that can store program code 214 for access by the processor 200. Examples of the memory unit 210 include but are not limited to a subscriber identity module (SIM), read-only memory (ROM), random-access memory (RAM), CD-ROMs and optical data storage devices. The communication interfacing unit 220 may be preferably a radio transceiver and accordingly exchanges wireless signals according to processing results of the processor 200.

#A GPRS detach procedure shall be invoked by a UE if the UE is switched off, the SIM/USIM (subscriber identity module/Universal Subscriber Identity Module) card is removed from the UE or if the GPRS or non-GPRS capability of the UE is disabled. The procedure may be invoked by a network to detach an IMSI (International Mobile Subscriber Identity) for GPRS services. The GPRS detach procedure causes the UE to be marked as inactive in the network for GPRS services, non-GPRS services or both services. The loose SIM contact may be caused by some mechanical problems. For example, a user drops the phone while in a call.