Patents by Inventor Serdar Sahin

Serdar Sahin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10003641
    Abstract: Methods implemented in a network device are disclosed for maintaining session integrity through load balancing. The method assigns a same virtual Internet protocol VIPA to the network device and a set of servers. The network device is assigned a set of next hop IP addresses, where each next hop IP address corresponds to a route to a server, and the VIPA of the network device is advertised to outside of the load balancing system. When a packet is a first packet from a source of a communication session and destined to the VIPA, the network device selects a next hop IP address to forward to a server according to its load balancing policy. The selection is saved so that subsequent packets of the same communication session from the same source will be forwarded to the same server.
    Type: Grant
    Filed: September 16, 2014
    Date of Patent: June 19, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Serdar Sahin, Qiwen Zhang
  • Patent number: 9515850
    Abstract: An emergency call in an all Internet Protocol (IP) network having GPRS access is able to be completed without a valid SIM. A valid Subscriber Identity Module is substituted for the missing or invalid SIM only when an emergency call is attempted. The emergency call is either sent via an IMSI from an embedded SIM provided by the UE making the emergency call, or the emergency call is modified with an IMSI substituted by an Emergency SIM Pool Function prior to being sent to the HLR for validation. The SIM is valid for the UE's emergency call so the emergency call is completed because the UE is considered validated by the network.
    Type: Grant
    Filed: February 9, 2010
    Date of Patent: December 6, 2016
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Serdar Sahin, Steven Nguyen
  • Publication number: 20160080505
    Abstract: Methods implemented in a network device are disclosed for maintaining session integrity through load balancing. The method assigns a same virtual Internet protocol VIPA to the network device and a set of servers. The network device is assigned a set of next hop IP addresses, where each next hop IP address corresponds to a route to a server, and the VIPA of the network device is advertised to outside of the load balancing system. When a packet is a first packet from a source of a communication session and destined to the VIPA, the network device selects a next hop IP address to forward to a server according to its load balancing policy. The selection is saved so that subsequent packets of the same communication session from the same source will be forwarded to the same server.
    Type: Application
    Filed: September 16, 2014
    Publication date: March 17, 2016
    Inventors: Serdar Sahin, Qiwen Zhang
  • Patent number: 8457114
    Abstract: Call placement to or from satellite UEs is optimized by reducing IMS message exchanges, the originating party has control over QoS parameters; a HPA subscription service is made available, and calls to a terminating satellite UE that is shielded from satellite coverage are completed by selectively employing HPA pages. For a call request without preconditions, an IMS node associated with an originating UE uses the NRSCPA on Offer instead of using the standard terminating node initiated NRSCPA on Answer. An IMS node associated with a terminating UE checks for HPA subscription by the user. If subscribed, the terminating INVITE request is for a “Conversational” or “Interactive” service, and the terminating UE is in PMM_IDLE state, the satellite RAN pages the terminating UE using HPA.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: June 4, 2013
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Serdar Sahin, Steven Nguyen
  • Patent number: 8260290
    Abstract: A system and method for enabling a UE to roam to a visited IMS-based network from a home network that does not have an IMS infrastructure. A visiting UE sends to an Intelligent Roaming Application Server (I-RAS) in the visited network, a first SIP Registration message that includes a SIP URI identifying the UE as a visitor from a home network that does not have an IMS infrastructure. The I-RAS rejects the registration, but includes a temporary Tel URI in the rejection message. The UE sends a second Registration message using the temporary Tel URI, which is forwarded to a Visited S-CSCF for authentication. The S-CSCF returns authentication vectors, which the UE uses to compute ciphering parameters and establish an IPSEC connection with a Visited P-CSCF. The UE then sends a third Registration message, which is accepted, and registration in the visited network is complete. The I-RAS acts as a pseudo Visited MSC/VLR and performs an update location procedure with the visiting UE's home network.
    Type: Grant
    Filed: November 24, 2008
    Date of Patent: September 4, 2012
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Todd A. Pressley, Kevin Stiles, Serdar Sahin
  • Publication number: 20110194553
    Abstract: An emergency call in an all Internet Protocol (IP) network having GPRS access is able to be completed without a valid SIM. A valid Subscriber Identity Module is substituted for the missing or invalid SIM only when an emergency call is attempted. The emergency call is either sent via an IMSI from an embedded SIM provided by the UE making the emergency call, or the emergency call is modified with an IMSI substituted by an Emergency SIM Pool Function prior to being sent to the HLR for validation. The SIM is valid for the UE's emergency call so the emergency call is completed because the UE is considered validated by the network.
    Type: Application
    Filed: February 9, 2010
    Publication date: August 11, 2011
    Inventors: Serdar Sahin, Steven Nguyen
  • Publication number: 20110075655
    Abstract: Call placement to or from satellite UEs is optimized by reducing IMS message exchanges, the originating party has control over QoS parameters; a HPA subscription service is made available, and calls to a terminating satellite UE that is shielded from satellite coverage are completed by selectively employing HPA pages. For a call request without preconditions, an IMS node associated with an originating UE uses the NRSCPA on Offer instead of using the standard terminating node initiated NRSCPA on Answer. An IMS node associated with a terminating UE checks for HPA subscription by the user. If subscribed, the terminating INVITE request is for a “Conversational” or “Interactive” service, and the terminating UE is in PMM_IDLE state, the satellite RAN pages the terminating UE using HPA.
    Type: Application
    Filed: August 31, 2010
    Publication date: March 31, 2011
    Inventors: Serdar Sahin, Steven Nguyen
  • Publication number: 20100085937
    Abstract: A system and method for enabling a UE to roam to a visited IMS-based network from a home network that does not have an IMS infrastructure. A visiting UE sends to an Intelligent Roaming Application Server (I-RAS) in the visited network, a first SIP Registration message that includes a SIP URI identifying the UE as a visitor from a home network that does not have an IMS infrastructure. The I-RAS rejects the registration, but includes a temporary Tel URI in the rejection message. The UE sends a second Registration message using the temporary Tel URI, which is forwarded to a Visited S-CSCF for authentication. The S-CSCF returns authentication vectors, which the UE uses to compute ciphering parameters and establish an IPSEC connection with a Visited P-CSCF. The UE then sends a third Registration message, which is accepted, and registration in the visited network is complete. The I-RAS acts as a pseudo Visited MSC/VLR and performs an update location procedure with the visiting UE's home network.
    Type: Application
    Filed: November 24, 2008
    Publication date: April 8, 2010
    Inventors: Todd A Pressley, Kevin Stiles, Serdar Sahin
  • Publication number: 20100054177
    Abstract: A system and method of using IP Multimedia System (IMS) for call setup in Mobile Satellite Systems. The method begins by a unit equipment (UE) originating a call to a second party. Next, secondary Packet Data Protocol (PDP) Context is initiated after originating the call. At least a portion of progress and acknowledgement message exchanges are handled by a Satellite Session Initiation Protocol Gateway (SSGW) in a Mobile Satellite System (MSS) on behalf of the UE without communicating with the UE. The call is then connected between the UE and the second party. A simplified Session Description Protocol (SDP) may be implemented for use between the UE and the SSGW to reduce the payload of Session Initiation Protocol (SIP) messaging. With a simplified SDP, one codec of the second party may be pre-provisioned in the SSGW.
    Type: Application
    Filed: January 14, 2009
    Publication date: March 4, 2010
    Inventors: Serdar Sahin, Kasi Narayanaswamy