公开(公告)号：US09648522B2

公开(公告)日：2017-05-09

申请号：US13930593

申请日：2013-06-28

Applicant: Huawei Technologies Co., Ltd.

Inventor： Xiaobo Wu ,  Hai Liu ,  Wei Xiao

IPC: H04W36/00 ,  H04W8/26 ,  H04W36/14 ,  H04W68/00 ,  H04W72/04 ,  H04W76/02

CPC classification number: H04W36/0022 ,  H04W8/26 ,  H04W36/14 ,  H04W68/00 ,  H04W72/042 ,  H04W76/10

Abstract: A method for voice call fallback to a circuit switched (CS) domain disclosed in the present invention includes: receiving a Service Request message from a calling user equipment (UE), where the Service Request message includes called number information of a voice call in a CS domain, instructing an evolved NodeB (eNB) to initiate circuit switched fallback (CSFB) handover; receiving a Handover Request message from the eNB, where the Handover Request message includes information required for CS handover, selecting a mobile switching center (MSC) and sending a packet switched (PS) to CS Handover Request message to the MSC, where the PS to CS Handover Request message carries information required for the CS handover and a called number so that the MSC calls a called UE. The corresponding apparatuses and systems are also disclosed. The technical solution of the present invention can reduce the connection delay.

公开(公告)号：US09497665B2

公开(公告)日：2016-11-15

申请号：US14561037

申请日：2014-12-04

Applicant: Huawei Technologies Co., Ltd.

Inventor： Xiaobo Wu ,  Hai Liu ,  Lin Shu ,  Yanyan Chen ,  Weisheng Jin

IPC: H04W40/00 ,  H04W36/00

CPC classification number: H04W36/0005 ,  H04W36/0016 ,  H04W36/0022 ,  H04W36/0033 ,  H04W36/0055 ,  H04W36/32 ,  H04W88/005

Abstract: Embodiments of the present invention disclose a method, a mobile switching center and a system for returning to a long term evolution network, which may prevent a UE which does not need to return to the LTE network from mistakenly returning to the LTE network. The method includes: receiving a first CSFB indication corresponding to a UE that is sent by a MME after the UE initiates CSFB, wherein the first CSFB indication is used for identifying that the UE needs to return to a LTE network after circuit service of the UE is finished; and sending, according to the first CSFB indication, a second CSFB indication corresponding to the UE to an RNC/BSC when the circuit service of the UE is finished, wherein the second CSFB indication is used for indicating that the RNC/BSC is to notify the UE of returning to the LTE network.

Abstract translation: 本发明的实施例公开了一种方法，移动交换中心和用于返回到长期演进网络的系统，其可以防止不需要返回LTE网络的UE错误地返回到LTE网络。 该方法包括：在UE发起CSFB之后，接收与MME发送的对应的UE的第一CSFB指示，其中，第一CSFB指示用于在UE的电路业务之后识别UE需要返回到LTE网络 结束了; 以及当所述UE的电路服务完成时，根据所述第一CSFB指示将与所述UE对应的第二CSFB指示发送到RNC / BSC，其中所述第二CSFB指示用于指示所述RNC / BSC要通知 UE返回LTE网络。

公开(公告)号：US09491667B2

公开(公告)日：2016-11-08

申请号：US14201030

申请日：2014-03-07

Applicant: Huawei Technologies Co., Ltd.

Inventor： Xiaobo Wu ,  Hai Liu ,  Wenruo Zhu

IPC: H04W4/00 ,  H04W36/00

CPC classification number: H04W36/0022

Abstract: The present invention discloses a method and a device for handover to a serving network. The method includes: receiving a first Handover Request sent by a BSC/RNC; sending a second Handover Request to a target MME according to the first Handover Request, where the second Handover Request includes an IMSI and first information for determining a source SGSN so that the MME sends a Context Request message including the IMSI to the source SGSN and receives context information of a UE that corresponds to the IMSI and is sent by the source SGSN. Thereby avoiding a handover failure which is caused because the MSC server and the SGSN select different MMEs, and further synchronizing PS and CS handover processes, improving handover accuracy and efficiency, and enhancing user experience.

Abstract translation: 本发明公开了一种切换到服务网络的方法和装置。 该方法包括：接收BSC / RNC发送的第一切换请求; 根据第一切换请求向目标MME发送第二切换请求，其中第二切换请求包括IMSI和用于确定源SGSN的第一信息，使得MME向源SGSN发送包括IMSI的上下文请求消息，并且接收 与IMSI对应并由源SGSN发送的UE的上下文信息。 从而避免由于MSC服务器和SGSN选择不同的MME导致的切换失败，并且进一步使PS和CS切换过程同步，从而提高切换精度和效率，并提高用户体验。

公开(公告)号：US20160100338A1

公开(公告)日：2016-04-07

申请号：US14966888

申请日：2015-12-11

Applicant: Huawei Technologies Co., Ltd.

Inventor： Xiaobo Wu ,  Hai Liu ,  Daliang Zhang ,  Xinyong Wang

IPC: H04W36/00 ,  H04L29/06

CPC classification number: H04W36/0022 ,  H04L65/1069

Abstract: The present invention discloses a network handover method, where after UE in an LTE network requests circuit switched fallback CSFB, an MME instructs an eNB to move the UE from the LTE network to a 2G or 3G network, and requests an MSC to hand over the UE from the LTE network to a CS domain of the 2G or 3G network for the CSFB, so that the 2G or 3G network allocates a CS domain resource to the UE. After handing over to the CS domain, the UE may perform a CS domain call. By using embodiments of the present invention, an access delay is reduced when the UE accesses the CS domain of the 2G or 3G network, duration of an entire voice call is shortened, and user experience is improved.

Abstract translation: 本发明公开了一种网络切换方法，其中在LTE网络中的UE请求电路交换回退CSFB之后，MME指示eNB将UE从LTE网络移动到2G或3G网络，并请求MSC切换 UE从LTE网络到用于CSFB的2G或3G网络的CS域，使得2G或3G网络向UE分配CS域资源。 移交给CS域后，UE可以执行CS域呼叫。 通过使用本发明的实施例，当UE接入2G或3G网络的CS域时，减少了接入延迟，缩短了整个语音呼叫的持续时间，提高了用户体验。