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Derivation of user equipment identifiers

A technology of user equipment and subscriber identification module, applied in the direction of transmission system, electrical components, wireless communication, etc., can solve the problem of not having the ability to receive services, not being able to derive GAN and I-WLAN feature identifiers/parameters, and not being able to determine Use 2-digit MNC or 3-digit MNC, etc.

Inactive Publication Date: 2010-01-06
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0015] However, a UE with a SIM still cannot always know which digits of the IMSI belong to the MNC without the help of the PLMN's broadcast channel messages
Furthermore, even if the HPLMN provides the necessary broadcast messages, the I-WLAN and GAN features allow for improved indoor coverage making it increasingly likely that the UE does not have the capability to receive service from its HPLMN in the usual way
Therefore, a UE with a SIM will in many cases not be able to determine whether to use a 2-digit MNC or a 3-digit MNC in its IMSI, and thus such a UE will not be able to derive the GAN and I-WLAN features and identifiers / parameters required to enable UE to obtain network services

Method used

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  • Derivation of user equipment identifiers
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Embodiment Construction

[0026] The inventors have realized that when a UE with a SIM cannot a priori know whether the MNC is 2 or 3 digits, it is always possible for the UE to determine which form of MNC (2 digits or 3 digits) to include in its IMSI number). According to a first technique for determining the MNC form, the UE accesses a table or list containing the information necessary for the UE to always be sure whether to use a 2-digit MNC or a 3-digit MNC in its IMSI. For example, a table can be stored in the UE and contain all possible countries and corresponding networks indicated by the MCC and the corresponding MNC. Using such a table, the UE, or rather a processor in the UE, can determine by first determining the MCC from its IMSI, then finding the determined MCC in the stored table, and then reading the MNC corresponding to that MCC Its MNC.

[0027] Of course, other configurations of tables are also possible. For example, a table could contain only countries (MCC) using a 3-digit MNC. ...

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Abstract

Solutions are described that enable a user equipment (UE) for a communication system always to derive required identifiers using an international mobile subscriber identity (IMSI). The Mobile Network Code (MNC) may be two or three digits long. The SIM may not provide information regarding the MNC length. One solution is based on a table, or list, that is maintained in the UE and which is used to retrieve the MNC for a given Mobile Country Code (MCC). Another solution is based on always taking a predetermined number of digits of the IMSI and determining the MNC in a DNS server. Yet another solution is based on try-and-fail signaling with a DNS server. In consequence, the UE does not always need to know how many digits of the IMSI are used to indicate the mobile network code (MNC), which in some situations is impossible to know anyway.

Description

technical field [0001] The present invention relates to electronic communication systems, and more particularly to packet data communication systems. Background technique [0002] Electronic communication systems include Time Division Multiple Access (TDMA) systems such as cellular radiotelephone systems complying with the GSM telecommunications standard and enhancements thereof such as General Packet Radio Service (GPRS) and Enhanced Data Rates for GSM Evolution (EDGE); and code division Multiple Access (CDMA) systems, such as cellular radiotelephone systems conforming to IS-95, cdma2000, and Wideband-CDMA (WCDMA) telecommunications standards. Electronic communication systems also include "hybrid" TDMA and CDMA systems, such as cellular radiotelephone systems conforming to the Universal Mobile Telecommunications System (UMTS) standard specified by the European Telecommunications Standards Institute (ETSI) at the International Telecommunication Union (ITU). A third generati...

Claims

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Application Information

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IPC IPC(8): H04W8/26H04W88/02
CPCH04W8/26H04L61/4511H04L2101/33H04W88/02
Inventor C·赫雷罗维龙A·-L·赫德伯格R·约翰尼森
Owner TELEFON AB LM ERICSSON (PUBL)
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