United States Patent 9,848,358
Somasundaram , et al. December 19, 2017
Apparatus to enable fallback to circuit switched domain from packet switched domain
Abstract
An apparatus is used to perform a Circuit Switched (CS) fallback in wireless communications. The Non-Access Stratum (NAS) of the apparatus determines whether to perform a CS fallback based on an Internet Protocol (IP) Multimedia Subsystem (IMS) registration status, and sends a service request indicating a request to perform the CS fallback when the WTRU is attached to a CS domain. The apparatus also includes an Access Stratum (AS) that receives the CS service request from the NAS, sends an indication of the CS service request in a Radio Resource Control (RRC) message to an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN), wherein the RRC message includes CS service information, and receives a handover command in response to the CS service request.
Inventors:
Somasundaram; Shankar (Sunnyvale, CA), Sammour; Mohammed (Amman, JO), Olvera-Hernandez; Ulises (Kirkland, CA), Mukherjee; Rajat (Toronto, CA), Livet; Catherine (Montreal, CA)
Applicant:
Name
City
State
Country
Type
InterDigital Patent Holdings, Inc.
Wilmington
DE
US
Assignee:
InterDigital Patent Holdings, Inc. (Wilmington, DE)
Family ID:
1000003018087
Appl. No.:
14/069,963
Filed:
November 1, 2013
Prior Publication Data
Document Identifier
Publication Date
US 20140192772 A1 Jul 10, 2014
Related U.S. Patent Documents
Application Number
Filing Date
Patent Number
Issue Date
12408028 Mar 20, 2009 8599791
61038701 Mar 21, 2008
Current U.S. Class: 1/1
Current CPC Class: H04W 36/0022 (20130101); H04W 36/0033 (20130101); H04W 80/10 (20130101)
Current International Class: H04W 36/00 (20090101); H04W 80/10 (20090101)
Field of Search: ;370/331
PPP
"Intellectuals solve problems; geniuses prevent them." - Albert Einstein
