公开(公告)号：US08982836B2

公开(公告)日：2015-03-17

申请号：US13275076

申请日：2011-10-17

Applicant: Suli Zhao ,  Ajith T. Payyappilly ,  Shrawan K. Khatri ,  Siddharth D. Chitnis

Inventor： Suli Zhao ,  Ajith T. Payyappilly ,  Shrawan K. Khatri ,  Siddharth D. Chitnis

IPC: H04W4/00 ,  H04W36/00 ,  H04W76/06

CPC classification number: H04W36/0011 ,  H04W76/30

Abstract: A method for maintaining IP context during an inter RAT handover of a UE between an eHRPD network and an LTE network may include delaying a transfer of an Internet Protocol context for at least one active packet data network until an IP address for an attach (PDN) Packet Data Network has been assigned and in the case where the Internet Protocol address for the Attach Packet Data Network is not assigned, initiating a detach operation from the LTE network without the user equipment losing the Internet Protocol context of the at least one active Packet Data Network.

Abstract translation: 在UE在eHRPD网络和LTE网络之间的RAT间切换期间维护IP上下文的方法可以包括延迟用于至少一个活动分组数据网络的因特网协议上下文的传输，直到用于附着（PDN）的IP地址为止， 已经分配了分组数据网络，并且在未分配用于附接分组数据网络的因特网协议地址的情况下，从LTE网络发起分离操作，而用户设备丢失了至少一个活动分组数据的因特网协议上下文 网络。

公开(公告)号：US20120320733A1

公开(公告)日：2012-12-20

申请号：US13460788

申请日：2012-04-30

Applicant: Suli Zhao ,  Ajith Tom Payyappilly ,  Jinghui Yang ,  Sidharth D. Chitnis ,  Shrawan Kumar Khatri

Inventor： Suli Zhao ,  Ajith Tom Payyappilly ,  Jinghui Yang ,  Sidharth D. Chitnis ,  Shrawan Kumar Khatri

IPC: H04W24/00 ,  H04W36/00

CPC classification number: H04W76/20 ,  H04W36/0011

Abstract: During inter-radio access technology (IRAT) handover between LTE and eHRPD technologies, Internet protocol (IP) service continuity at a user equipment (UE) may be maintained. Thus, a method, an apparatus, and a computer program product are provided for maintaining the IP service continuity during IRAT handover from an SRAT to a TRAT within an evolved packet core (EPC)—capable region. The apparatus attempts to transfer an EPC context to a TRAT, determines that a failure occurs when attempting to transfer the EPC context to the TRAT, and attempts to maintain at least one IP service continuity within the EPC context according to the failure. The attempt to maintain may include an attempt to maintain an entire EPC context or a set of parameters including at least one of an IP address, a domain name system (DNS) address, a proxy call session control function (P-CSCF) address, or a quality of service (QoS).

Abstract translation: 在LTE和eHRPD技术之间的无线间接入技术（IRAT）切换期间，可以维护用户设备（UE）处的因特网协议（IP）业务连续性。 因此，提供了一种方法，装置和计算机程序产品，用于在演进的分组核心（EPC）能力区域内的SRAT到SRAT之间的TRAT切换期间维持IP服务连续性。 该设备尝试将EPC上下文传送到TRAT，确定在尝试将EPC上下文传送到TRAT时发生故障，并尝试根据故障在EPC上下文内保持至少一个IP服务连续性。 维护的尝试可以包括维护整个EPC上下文或一组参数的尝试，包括IP地址，域名系统（DNS）地址，代理呼叫会话控制功能（P-CSCF）地址， 或服务质量（QoS）。