JP2010533390A5 - - Google Patents

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JP2010533390A5
JP2010533390A5 JP2010513633A JP2010513633A JP2010533390A5 JP 2010533390 A5 JP2010533390 A5 JP 2010533390A5 JP 2010513633 A JP2010513633 A JP 2010513633A JP 2010513633 A JP2010513633 A JP 2010513633A JP 2010533390 A5 JP2010533390 A5 JP 2010533390A5
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key
mme
nas
authentication vector
security algorithm
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JP2010513633A
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JP4976548B2 (ja
JP2010533390A (ja
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JP2010513633A 2007-08-31 2008-08-27 端末が移動するときにセキュリティ機能を折衝するための方法、システム、および装置 Active JP4976548B2 (ja)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
CN200710145703 2007-08-31
CN200710145703.3 2007-08-31
CN200710151700.0 2007-09-26
CN2007101517000A CN101378591B (zh) 2007-08-31 2007-09-26 终端移动时安全能力协商的方法、系统及装置
PCT/CN2008/072165 WO2009030155A1 (fr) 2007-08-31 2008-08-27 Procédé, système et appareil pour négocier les capacités de sécurité lors du déplacement d'un terminal

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JP2010533390A JP2010533390A (ja) 2010-10-21
JP2010533390A5 true JP2010533390A5 (enExample) 2012-04-19
JP4976548B2 JP4976548B2 (ja) 2012-07-18

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JP2010513633A Active JP4976548B2 (ja) 2007-08-31 2008-08-27 端末が移動するときにセキュリティ機能を折衝するための方法、システム、および装置

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US (7) US8656169B2 (enExample)
EP (2) EP2139175B3 (enExample)
JP (1) JP4976548B2 (enExample)
CN (1) CN101378591B (enExample)
ES (1) ES2401039T7 (enExample)
PL (1) PL2139175T6 (enExample)
RU (1) RU2435319C2 (enExample)
WO (1) WO2009030155A1 (enExample)

Families Citing this family (75)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101378591B (zh) 2007-08-31 2010-10-27 华为技术有限公司 终端移动时安全能力协商的方法、系统及装置
CN101400059B (zh) * 2007-09-28 2010-12-08 华为技术有限公司 一种active状态下的密钥更新方法和设备
US8819765B2 (en) * 2008-01-22 2014-08-26 Telefonaktiebolaget L M Ericsson (Publ) Security policy distribution to communication terminals
JP5156581B2 (ja) * 2008-10-31 2013-03-06 株式会社エヌ・ティ・ティ・ドコモ 移動局
WO2010094319A1 (en) * 2009-02-17 2010-08-26 Telefonaktiebolaget Lm Ericsson (Publ) Method for controlling a communication network, servers, systems including servers, and computer programs
CN101505479B (zh) * 2009-03-16 2014-04-30 中兴通讯股份有限公司 一种认证过程中安全上下文协商方法和系统
CN101854625B (zh) * 2009-04-03 2014-12-03 华为技术有限公司 安全算法选择处理方法与装置、网络实体及通信系统
CN101557589A (zh) * 2009-05-04 2009-10-14 中兴通讯股份有限公司 防止空完整性保护算法用于正常通信的方法和系统
EP2486749B1 (en) * 2009-10-05 2014-06-04 Telefonaktiebolaget L M Ericsson (PUBL) Method and arrangement in a telecommunication system
CN101720118B (zh) * 2009-12-15 2013-04-24 华为技术有限公司 接入网络的方法、设备和系统
DE102010011022A1 (de) 2010-03-11 2012-02-16 Siemens Aktiengesellschaft Verfahren zur sicheren unidirektionalen Übertragung von Signalen
US9084110B2 (en) * 2010-04-15 2015-07-14 Qualcomm Incorporated Apparatus and method for transitioning enhanced security context from a UTRAN/GERAN-based serving network to an E-UTRAN-based serving network
US9197669B2 (en) 2010-04-15 2015-11-24 Qualcomm Incorporated Apparatus and method for signaling enhanced security context for session encryption and integrity keys
CN102845105B (zh) 2010-04-16 2016-03-16 高通股份有限公司 用于从支持增强型安全性上下文的服务网络节点向旧式服务网络节点转移的装置和方法
CN101835151B (zh) * 2010-04-16 2016-03-30 中兴通讯股份有限公司 空中接口密钥的更新方法及无线接入系统
CN102244862A (zh) * 2010-05-10 2011-11-16 北京三星通信技术研究有限公司 一种获取安全密钥的方法
CN102244874B (zh) * 2010-05-10 2015-08-12 中兴通讯股份有限公司 一种系统间重选频次统计方法及装置
GB2481395A (en) 2010-06-21 2011-12-28 Nec Casio Mobile Comm Ltd Call set-up management in a mobile radio communications network
CN102625300B (zh) 2011-01-28 2015-07-08 华为技术有限公司 密钥生成方法和设备
US8897751B2 (en) * 2011-03-14 2014-11-25 Alcatel Lucent Prevention of eavesdropping type of attack in hybrid communication system
WO2012154325A1 (en) 2011-04-01 2012-11-15 Interdigital Patent Holdings, Inc. Method and apparatus for controlling connectivity to a network
EP2530881B1 (en) * 2011-06-27 2014-02-12 Huawei Technologies Co., Ltd. Media access control address protection method and switch
CN103179559B (zh) * 2011-12-22 2016-08-10 华为技术有限公司 一种低成本终端的安全通信方法、装置及系统
CN107071768B (zh) * 2012-02-22 2020-03-20 华为技术有限公司 建立安全上下文的方法、装置及系统
KR102095405B1 (ko) * 2012-05-10 2020-03-31 삼성전자주식회사 데이터 패킷들의 업링크 및 다운링크 동안 비연결형 전송을 위한 방법 및 시스템
KR101444434B1 (ko) 2012-07-10 2014-09-24 주식회사 케이티 트래킹 영역 업데이트 방법, 페이징 방법 및 이를 지원하는 디지털 신호 처리 장치
US9591679B2 (en) 2012-09-17 2017-03-07 Blackberry Limited Initiation of inter-device communication in wireless communication systems
US9826381B2 (en) 2012-09-18 2017-11-21 Blackberry Limited Device handshake/discovery for inter-device communication in wireless communication systems
US9014113B2 (en) 2012-09-21 2015-04-21 Blackberry Limited User equipment architecture for inter-device communication in wireless communication systems
US8982895B2 (en) 2012-09-21 2015-03-17 Blackberry Limited Inter-device communication in wireless communication systems
US10154467B2 (en) 2012-09-26 2018-12-11 Blackberry Limited Transmit power adjustment for inter-device communication in wireless communication systems
US9137836B2 (en) * 2012-10-15 2015-09-15 Blackberry Limited Inter-device communication authorization and data sniffing in wireless communication systems
US8930700B2 (en) * 2012-12-12 2015-01-06 Richard J. Wielopolski Remote device secure data file storage system and method
EP2944067B1 (en) * 2013-01-10 2023-03-01 NEC Corporation Mtc key management for key derivation at both ue and network
EP3247141B1 (en) * 2013-01-30 2018-12-12 Telefonaktiebolaget LM Ericsson (publ) Security activation for dual connectivity
FR3010273B1 (fr) * 2013-09-04 2015-08-14 Thales Sa Procede de traitement de cles d'authentification dans un systeme de telecommunications sans fil et systeme de telecommunication associe
CN104683981B (zh) * 2013-12-02 2019-01-25 华为技术有限公司 一种验证安全能力的方法、设备及系统
US10652733B2 (en) 2013-12-24 2020-05-12 Nec Corporation Apparatus, system and method for SCE
CN104754577B (zh) * 2013-12-31 2019-05-03 华为技术有限公司 一种选择认证算法的方法、装置及系统
EP3146741B1 (en) * 2014-05-20 2021-10-06 Nokia Technologies Oy Cellular network authentication control
US9693219B2 (en) 2014-10-24 2017-06-27 Ibasis, Inc. User profile conversion to support roaming
CN107925956B (zh) * 2015-08-21 2021-06-08 三星电子株式会社 用于蜂窝设备中的空闲模式的卸载操作的方法和装置
US9883385B2 (en) 2015-09-15 2018-01-30 Qualcomm Incorporated Apparatus and method for mobility procedure involving mobility management entity relocation
US10555177B2 (en) 2015-10-05 2020-02-04 Telefonaktiebolaget Lm Ericsson (Publ) Method of operation of a terminal device in a cellular communications network
US11374941B2 (en) 2015-11-02 2022-06-28 Telefonaktiebolaget Lm Ericsson (Publ) Wireless communications
WO2017084043A1 (en) * 2015-11-18 2017-05-26 Alcatel-Lucent Shanghai Bell Co., Ltd. Handover between e-utran and wlan
US10674364B2 (en) 2015-12-14 2020-06-02 Lg Electronics Inc. Operation method for preventing latent erroneous operation of terminal in wireless communication system, and apparatus for same
JP6598225B2 (ja) 2016-01-05 2019-10-30 華為技術有限公司 モバイル通信方法、装置、およびデバイス
WO2018006215A1 (zh) * 2016-07-04 2018-01-11 华为技术有限公司 管理终端设备的imsi状态的方法、装置及系统
KR102358918B1 (ko) * 2016-07-04 2022-02-07 삼성전자 주식회사 무선 통신 시스템에서 서비스에 따른 보안 관리 방법 및 장치
EP3471365A4 (en) * 2016-07-15 2019-06-19 Huawei Technologies Co., Ltd. METHOD AND DEVICE FOR KEY RECORDING
US11275852B2 (en) * 2016-08-22 2022-03-15 Nokia Technologies Oy Security procedure
WO2018132952A1 (zh) * 2017-01-17 2018-07-26 华为技术有限公司 无线通信的方法和装置
CN108616881A (zh) * 2017-01-24 2018-10-02 中兴通讯股份有限公司 连接重建的认证方法、基站、用户设备、核心网及系统
EP3952375B1 (en) * 2017-01-30 2022-11-23 Telefonaktiebolaget LM Ericsson (publ) Security context handling in 5g during connected mode
US11172359B2 (en) * 2017-08-09 2021-11-09 Lenovo (Singapore) Pte. Ltd. Method and apparatus for attach procedure with security key exchange for restricted services for unauthenticated user equipment
US11297502B2 (en) 2017-09-08 2022-04-05 Futurewei Technologies, Inc. Method and device for negotiating security and integrity algorithms
US10512005B2 (en) 2017-09-29 2019-12-17 Nokia Technologies Oy Security in intersystem mobility
EP4142215B1 (en) 2017-10-30 2024-02-14 Huawei Technologies Co., Ltd. Method and apparatus for obtaining ue security capabilities
WO2019174015A1 (zh) 2018-03-15 2019-09-19 Oppo广东移动通信有限公司 处理数据的方法、接入网设备和核心网设备
CN112738804B (zh) 2017-11-17 2021-12-21 华为技术有限公司 一种安全保护的方法及装置
US10542428B2 (en) 2017-11-20 2020-01-21 Telefonaktiebolaget Lm Ericsson (Publ) Security context handling in 5G during handover
CN110099382B (zh) * 2018-01-30 2020-12-18 华为技术有限公司 一种消息保护方法及装置
CN118175540A (zh) 2018-02-19 2024-06-11 瑞典爱立信有限公司 支持不同无线通信系统之间的互通和/或移动性
TWI714968B (zh) * 2018-02-22 2021-01-01 新加坡商 聯發科技（新加坡）私人有限公司 追蹤區域更新程序改良之方法及其裝置
CN111385090B (zh) * 2018-12-29 2023-03-10 山东量子科学技术研究院有限公司 基于多密钥组合量子密钥中继的密钥分发方法及其系统
KR102582321B1 (ko) * 2019-01-15 2023-09-22 텔레폰악티에볼라겟엘엠에릭슨(펍) 무선 장치의 무선 액세스 능력
US11470473B2 (en) * 2019-01-18 2022-10-11 Qualcomm Incorporated Medium access control security
CN110336771A (zh) * 2019-04-09 2019-10-15 生迪智慧科技有限公司 组网方法、装置及计算机可读存储介质
CN111866974B (zh) * 2019-04-29 2022-12-06 华为技术有限公司 用于移动注册的方法和装置
CN113098688B (zh) * 2020-01-09 2022-05-06 大唐移动通信设备有限公司 一种aka方法及装置
CN113381966B (zh) * 2020-03-09 2023-09-26 维沃移动通信有限公司 信息上报方法、信息接收方法、终端及网络侧设备
US12143870B2 (en) 2021-05-12 2024-11-12 Qualcomm Incorporated Security handling of 5GS to EPC reselection
US11895159B2 (en) * 2021-06-30 2024-02-06 International Business Machines Corporation Security capability determination
CN114222303B (zh) * 2021-12-09 2024-09-20 北京航空航天大学 实现ue定制机密性和完整性保护算法的方法及装置

Family Cites Families (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6028933A (en) * 1997-04-17 2000-02-22 Lucent Technologies Inc. Encrypting method and apparatus enabling multiple access for multiple services and multiple transmission modes over a broadband communication network
US6671507B1 (en) 2000-06-16 2003-12-30 Siemens Aktiengesellschaft Authentication method for inter-system handover between at least two radio communications systems
US7181012B2 (en) * 2000-09-11 2007-02-20 Telefonaktiebolaget Lm Ericsson (Publ) Secured map messages for telecommunications networks
FI111423B (fi) 2000-11-28 2003-07-15 Nokia Corp Järjestelmä kanavanvaihdon jälkeen tapahtuvan tietoliikenteen salauksen varmistamiseksi
US6857075B2 (en) * 2000-12-11 2005-02-15 Lucent Technologies Inc. Key conversion system and method
RU2174924C1 (ru) * 2001-03-01 2001-10-20 Архипов Кирилл Леонидович Система безопасности мобильных объектов
US20030028644A1 (en) 2001-08-02 2003-02-06 Patrick Maguire System and method for load sharing within a core network
US20030139180A1 (en) * 2002-01-24 2003-07-24 Mcintosh Chris P. Private cellular network with a public network interface and a wireless local area network extension
AU2003226976A1 (en) 2002-03-08 2003-09-22 Sony Ericsson Mobile Communications Ab Security protection for data communication
US20030235305A1 (en) * 2002-06-20 2003-12-25 Hsu Raymond T. Key generation in a communication system
US7310307B1 (en) 2002-12-17 2007-12-18 Cisco Technology, Inc. System and method for authenticating an element in a network environment
CN1186906C (zh) * 2003-05-14 2005-01-26 东南大学 无线局域网安全接入控制方法
GB0311921D0 (en) 2003-05-23 2003-06-25 Ericsson Telefon Ab L M Mobile security
US8140054B2 (en) 2003-10-31 2012-03-20 Electronics And Telecommunications Research Institute Method for authenticating subscriber station, method for configuring protocol thereof, and apparatus thereof in wireless portable internet system
CN100415034C (zh) 2004-09-30 2008-08-27 西安西电捷通无线网络通信有限公司 一种使移动节点实现自代理功能的方法
CN100574185C (zh) 2005-01-07 2009-12-23 华为技术有限公司 在ip多媒体业务子系统网络中保障媒体流安全性的方法
JP2008530879A (ja) * 2005-02-11 2008-08-07 ノキア コーポレイション 通信ネットワークにおいてブートストラッピング手順を提供する方法及び装置
JP3829862B1 (ja) 2005-04-04 2006-10-04 トヨタ自動車株式会社 ３次元モデル変形システム及びプログラム
ATE520276T1 (de) * 2005-04-26 2011-08-15 Vodafone Plc Schneller benutzerebenenaufbau in einem telekommunikationsnetzwerk
CN100373991C (zh) * 2005-06-30 2008-03-05 中国科学院计算技术研究所 一种分组网络中语音通信的加密协商方法
US8027304B2 (en) * 2005-07-06 2011-09-27 Nokia Corporation Secure session keys context
US7843900B2 (en) * 2005-08-10 2010-11-30 Kineto Wireless, Inc. Mechanisms to extend UMA or GAN to inter-work with UMTS core network
EP1764970A1 (en) * 2005-09-19 2007-03-21 Matsushita Electric Industrial Co., Ltd. Multiple interface mobile node with simultaneous home- and foreign network connection
CN1937487A (zh) 2005-09-22 2007-03-28 北京三星通信技术研究有限公司 Lte中鉴权和加密的方法
US8122240B2 (en) * 2005-10-13 2012-02-21 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for establishing a security association
US20070117563A1 (en) 2005-10-28 2007-05-24 Interdigital Technology Corporation Call setup procedure in an evolved third generation radio access network
EP1784035A1 (en) * 2005-11-07 2007-05-09 Alcatel Lucent A method for connection re-establishment in a mobile communication system
WO2007063420A2 (en) 2005-12-01 2007-06-07 Nokia Corporation Authentication in communications networks
CN1983921B (zh) * 2005-12-16 2010-05-05 华为技术有限公司 一种端到端媒体流安全的实现方法及系统
US7929703B2 (en) * 2005-12-28 2011-04-19 Alcatel-Lucent Usa Inc. Methods and system for managing security keys within a wireless network
US7483409B2 (en) 2005-12-30 2009-01-27 Motorola, Inc. Wireless router assisted security handoff (WRASH) in a multi-hop wireless network
KR101213285B1 (ko) * 2006-01-04 2012-12-17 삼성전자주식회사 이동통신 시스템에서 아이들모드 단말기의 세션 설정 프로토콜 데이터를 전송하는 방법 및 장치
US7911943B2 (en) 2006-01-13 2011-03-22 Nokia Corporation Optimization of PDP context usage
DE102006006485A1 (de) 2006-02-10 2007-08-23 T-Mobile International Ag & Co. Kg Verfahren zur Durchführung eines Pagings in einem zellularen Mobilkommunikationssystem
PL1989906T3 (pl) * 2006-02-28 2017-08-31 Nokia Technologies Oy Przekazywanie w sieciach komunikacyjnych
EP1997269A4 (en) * 2006-03-22 2014-01-08 Lg Electronics Inc ASYMMETRIC CRYPTOGRAPHY FOR WIRELESS SYSTEMS
WO2007108651A1 (en) * 2006-03-22 2007-09-27 Lg Electronics Inc. Security considerations for the lte of umts
EP2005780A2 (en) * 2006-03-27 2008-12-24 Nokia Corporation Apparatus, method and computer program product providing unified reactive and proactive handovers
JP5059096B2 (ja) * 2006-03-31 2012-10-24 サムスン エレクトロニクス カンパニー リミテッド アクセスシステム間のハンドオーバー時の認証手順を最適化するシステム及び方法
KR20070099849A (ko) * 2006-04-05 2007-10-10 삼성전자주식회사 이동통신 시스템의 공통 라우팅 영역에 위치한 아이들사용자 단말기에게 회선교환 호를 전달하기 위한 방법 및장치
TWM322686U (en) 2006-04-19 2007-11-21 Interdigital Tech Corp Apparatus for supporting routing area update procedures in a long term evolution general packet radio service tunneling protocol-based system
GB0608612D0 (en) * 2006-05-02 2006-06-14 Vodafone Plc Telecommunications networks
US8682357B2 (en) 2006-05-02 2014-03-25 Intellectual Ventures Holding 81 Llc Paging in a wireless network
US20070271458A1 (en) * 2006-05-22 2007-11-22 Peter Bosch Authenticating a tamper-resistant module in a base station router
EP2030468B1 (en) * 2006-06-16 2023-05-17 Nokia Technologies Oy Changing lte specific anchor with simple tunnel switching
PL2036382T3 (pl) 2006-06-16 2020-02-28 Nokia Technologies Oy Urządzenie i sposób przesyłania informacji o kontekście protokołu danych pakietowych dla terminala w przypadku przełączania między systemami
EP2451134A1 (en) * 2006-06-19 2012-05-09 InterDigital Technology Corporation Method and apparatus for security protection of an original user identity in an initial signaling message
US20080045262A1 (en) 2006-08-16 2008-02-21 Vanvinh Phan Method and Apparatus for Providing Service-Based Cell Reselection
US8295243B2 (en) 2006-08-21 2012-10-23 Qualcomm Incorporated Method and apparatus for random access in an orthogonal multiple-access communication system
CN1953374A (zh) 2006-09-21 2007-04-25 中国船舶重工集团公司第七○九研究所 移动自组织网络中用于分布式身份认证的安全引导模型
EP1914930A1 (en) * 2006-10-17 2008-04-23 Matsushita Electric Industrial Co., Ltd. User plane entity selection in a mobile communication system having overlapping pool areas
WO2008046915A1 (en) 2006-10-20 2008-04-24 Nokia Corporation Generating keys for protection in next generation mobile networks
JP2010508761A (ja) 2006-10-30 2010-03-18 インターデイジタル テクノロジー コーポレーション ロングタームエボリューションシステムにおいてトラッキングエリア更新およびセル再選択を実施する方法および装置
FI20070095A0 (fi) * 2007-02-02 2007-02-02 Nokia Corp Turva-avainten luominen langatonta viestintää varten
CN102869007B (zh) 2007-02-05 2015-12-09 华为技术有限公司 安全算法协商的方法、装置及网络系统
FI20070157A0 (fi) * 2007-02-23 2007-02-23 Nokia Corp Nopea päivityssanomien autentikointi avainderivaatiolla mobiileissa IP-järjestelmissä
CN101304600B (zh) * 2007-05-08 2011-12-07 华为技术有限公司 安全能力协商的方法及系统
CN101309500B (zh) 2007-05-15 2011-07-20 华为技术有限公司 不同无线接入技术间切换时安全协商的方法和装置
US8533455B2 (en) 2007-05-30 2013-09-10 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for combining internet protocol authentication and mobility signaling
US20090016334A1 (en) 2007-07-09 2009-01-15 Nokia Corporation Secured transmission with low overhead
US8699711B2 (en) 2007-07-18 2014-04-15 Interdigital Technology Corporation Method and apparatus to implement security in a long term evolution wireless device
US20090046674A1 (en) 2007-08-17 2009-02-19 Chun Yan Gao Method and apparatus for providing channel feedback information
GB2452698B (en) 2007-08-20 2010-02-24 Ipwireless Inc Apparatus and method for signaling in a wireless communication system
CN101378591B (zh) 2007-08-31 2010-10-27 华为技术有限公司 终端移动时安全能力协商的方法、系统及装置
EP2214444A1 (en) * 2009-01-30 2010-08-04 Nec Corporation Method for optimizing the reduction of mobility signalling at inter-rat change

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