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Identifiers in Communication Net Works
Published in Giovanni Bartolomeo, Tatiana Kováčiková, Identification and Management of Distributed Data: NGN, Content-Centric Networks and the Web, 2016
Giovanni Bartolomeo, Tatiana Kováčiková
In GSM-based PLMNs, the E.164 (ITU 2010) number is often called a Mobile Station ISDN Number (MSISDN) to indicate that the E.164 number is used for mobile services. Another ID used in GSM networks is the International Mobile Subscriber Identity (IMSI), based on ITU-T Recommendation E.212 (ITU-T E.212; ITU 2008). The IMSI provides a unique identifier of the mobile subscription for registration purposes. It is also used to identify the Home Public Land Mobile Network (HPLMN) when the mobile subscriber–terminal is roaming in a Visited Public Land Mobile Network (VPLMN). Most of the present Subscriber Identity Module (SIM) cards used in GSM networks are marked with another ID called the Issuer Identification Number (IIN) according to ITU-T Recommendation E.118 (ITU-T E.118; ITU 2006).
Applying Low-Cost Software Radio for Experimental Analysis of LTE Security, Protocol Exploits, and Location Leaks
Published in Georgios Kambourakis, Asaf Shabtai, Constantinos Kolias, Dimitrios Damopoulos, Intrusion Detection and Prevention for Mobile Ecosystems, 2017
A number of identifiers are used in the operation of an LTE mobile network. The most important ones, in the context of this chapter, are the following: IMSI (International Mobile Subscriber Identity): This is a unique identifier for the SIM card in a mobile device. The IMSI is a secret identifier that should be kept private and not transmitted in the clear as it can be used to track devices and other types of exploits [9].TMSI (Temporary Mobile Subscriber Identifier): This is the identifier used to uniquely address a given device instead of the IMSI. Once the device connects to the network for the first time, a TMSI is derived and used thereafter. The TMSI is also refreshed periodically, though not as much as it should [4].MSISDN (Mobile Subscriber ISDN Number): This is the id that identifies the user and owner of a mobile device, that is, the user's phone number. It is mapped to the TMSI in a similar way a url is mapped to an IP address.IMEI (International Mobile Equipment Identifier): It uniquely identifies the hardware (i.e., smartphone) used to connect to the network. It can be thought as the serial number of a mobile device. The IMEI should ideally also be kept secret as, based on its value, one can easily know the type of mobile device the user has (make and model) and well as, in the case of an embedded M2M device, the software version it is running.
Authentication in Wireless Networks
Published in Yang Xiao, Security in Distributed, Grid, Mobile, and Pervasive Computing, 2007
Saikat Chakrabarti, Venkata C. Giruka, Mukesh Singhal
The Mobile Station: The mobile station consists of a mobile wireless equipment (a piece of hardware like a cell phone) and the subscriber information. The subscriber information includes a unique identifier of the subscriber, called the International Mobile Subscriber Identity (IMSI). The IMSI is stored in a smart card, called the Subscriber Identity Module (SIM). The subscriber uses the SIM card in his mobile device to make and receive calls and use other subscribed services (like the Short Message Service, which allows sending and receiving messages containing alphanumeric characters and/or images).
APRA: Affinity Propagation-Based Resource Allocation Scheme in M2M for System Capacity Maximization
Published in IETE Journal of Research, 2018
Hamayoun Shahwani, Phuc Chau, Jaehoon (Paul) Jeong, Jitae Shin
The RA procedure in LTE-A is classified into two types, such as contention-based RA and contention-free RA [6].Contention-based RA is done in four steps. In the first step, the UE sends a preamble message by selecting one among 64 orthogonal preambles via physical random access channel (PRACH). In the second step, the eNB sends a RAR that contains ID, uplink scheduling grant, uplink timing information, and a temporary identifier called cell radio network temporary identifier (CRNTI). In the third step, an international mobile subscriber identity (IMSI) is transmitted by the UE via physical up-link shared channel (PUSCH) for scheduling a radio resource request. In the last step, the eNB sends a contention resolution message via a physical down-link shared channel (PDSCH) containing the IMSI of the UE.Contention-free RA has three steps. In the first step, the eNB directly assigns a preamble to the UE, so the UE does not need to select a random preamble among 64 orthogonal preambles. In the second step, the UE sends a request using the assigned preamble. In the last step, the eNB sends an RAR to the UE. This generally happens in handover process.