The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 17, 2015
Filed:
Oct. 28, 2009
Zhengxiong Lei, Shanghai, CN;
Zhengxiong Lei, Shanghai, CN;
Alcatel Lucent, Boulogne-Billancourt, FR;
Abstract
The invention proposes a method and corresponding apparatuses for handing over a video conversation from a PS domain to a CS domain in a radio network. When signals of a network covered by the packet switch domain where the video conversation currently locates in are not good or become unavailable, as long as source MME and eNodeB detect the presence of video conversation, a procedure of handover to circuit switch domain for video bearer will be initiated, and a handover request will be transmitted to MSC server. After receiving the handover request, a control equipment in the circuit switch domain will request for resources to a target radio network requesting for the allocation of necessary communication link to the video bearer. In addition, after local UE has handed over to the target network (at this time, the communication link required for the video bearer between UE and MSC Server/MGW has already been established), local UE and MSC Server/MGW start a negotiation to establish a logical communication channel for the video conversation. Upon a successful negotiation, a logical communication channel for transferring video telephone service between MSC Server/MGW and UE is established. In this way, local UE can continue the video conversation with remote UE via MGW.