無線區域網路(Wireless LAN)是近幾年來最熱門的網路技術之一，相較於行之已久且發展成熟的GSM行動通信網路系統，無線區域網路能夠提供更高速的資料傳輸，但涵蓋範圍則不如GSM行動通信網路系統來得廣。隨著越來越多新的無線區域網路應用與服務被開發出來，未來用戶勢必將在GSM/GPRS行動通信網路系統與無線區域網路之間漫遊，因此這兩種異質性網路的整合也成為未來研究發展的重點之一。
在我們的研究中，我們將研究焦點放在GSM/GPRS行動通信網路系統與無線區域網路之間用戶身份認證機制的整合。基於現行GSM/GPRS系統的幾個強勢優點以及在用戶身份認證機制上的完整性及安全性，我們將研究如何將現行GSM/GPRS系統的用戶身份認證機制應用在無線區域網路的環境下，以達到兩種網路在用戶身份認證機制上的整合目的。

我們首先研究現行GSM/GPRS系統中用戶身份認證機制的運作方式。用戶識別模組(Subscriber Identity Module, SIM)乃是在現行GSM/GPRS系統的用戶身份認證機制中不可或缺的一部分，它儲存有用戶身份認證的相關訊息，在用戶端扮演重要的角色，也是整個機制中用戶端的運作重心所在。

在了解整個機制的運作流程之後，我們將嘗試建立一個基於用戶識別模組的無線區域網路用戶身份認證機制。我們也將研究欲建立此整合機制的相關課題，並詳細介紹整個整合機制的系統架構與運作流程。最後我們將討論此整合機制的優點、可以改進的部分以及未來可能發展的方向。

WLAN is a popular network technology in recent years. However, following the development of more and more WLAN related applications or services, WLAN users maybe roam between WLAN and GSM/GPRS network. Consequently, the integration between WLAN and GSM/GPRS network is an important and indispensable subject in the future. In our research, we focus on integrating the subscriber authentication scheme between WLAN and GSM/GPRS network.
We will research into the subscriber authentication scheme in existing GSM/GPRS system first, including the generation procedure of subscriber authentication related information and how the information be exchanged and verified between GSM/GPRS network side and MS side. After comprehending the related subjects, we will try to establish a SIM based subscriber authentication mechanism in WLAN environment by employing the subscriber authentication scheme in existing GSM/GPRS system.

We will induce some conclusion about our mechanism and some extended discussion about the subject also.

[1] GSM 03.03 v.7.5.0 Release 1998, Digital cellular telecommunications system (Phase 2+); Numbering, addressing and identification
[2] GSM 03.08 v.7.3.0 Release 1998, Digital cellular telecommunications system (Phase 2+); Organization of subscriber data
[3] GSM 03.20 v.8.1.0 Release 1999, Digital cellular telecommunications system (Phase 2+); Security related network functions
[4] GSM 11.11 v.8.3.0 Release 1999, Digital cellular telecommunications system (Phase 2+); Specification of the Subscriber Identity Module-Mobile Equipment (SIM - ME) interface
[5] ITU-T Q.700(03/1993), Introduction to CCITT Signaling System No.7
[6] Travis Russell, Signaling System # 7, 4th ed. 2002.
[7] ITU-T Q.773(06/1997), Specifications of Signaling System No. 7 – Transaction capabilities application part; Transaction capabilities formats and encoding
[8] ITU-T Q.771(06/1997), Specifications of Signaling System No. 7 – Transaction capabilities application part; Functional description of transaction capabilities
[9] ITU-T Q.772(06/1997), Specifications of Signaling System No. 7 – Transaction capabilities application part; Transaction capabilities information element definitions
[10] 3GPP TS 09.02 v.7.9.0 Release 1998, Digital cellular telecommunications system (Phase 2+); Mobile Application Part (MAP) Specification
[11] ITU-T X.208, Open systems interconnection model and notation; Specification of Abstract Syntax Notation One (ASN.1)
[12] ITU-T X.680(12/1997), OSI networking and system aspects – Abstract Syntax Notation One (ASN.1) Information technology – Abstract Syntax Notation One (ASN.1): Specification of basic notation
[13] John Larmouth, ASN.1 Complete, 1999.
[14] Olivier Dubuisson, ASN.1—Communication with Heterogeneous Systems, June 2000.
[15] ISO/IEC 7816-1:1998, Identification cards -- Integrated circuit(s) cards with contacts -- Part 1: Physical characteristics
[16] ISO/IEC 7816-2:1999, Information technology -- Identification cards -- Integrated circuit(s) cards with contacts -- Part 2: Dimensions and location of the contacts
[17] ISO/IEC 7816-3:1997, Information technology -- Identification cards -- Integrated circuit(s) cards with contacts -- Part 3: Electronic signals and transmission protocols
[18] GSM 02.17 v.8.0.0 Release 1999, Digital cellular telecommunications system (Phase 2+); Subscriber Identity Modules (SIM); Functional characteristics
[19] RFC 1541 of IETF, Dynamic Host Configuration Protocol, October 1993.
[20] NMS Communications, TCAP Developer’s Reference Manual, 2001.