Patents by Inventor Ragulan Sinnarajah

Ragulan Sinnarajah 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: 7254394
    Abstract: A method and system for a handoff in a broadcast communication system is disclosed. A subscriber assisted handoff is impractical in a broadcast communication system due to e.g., a high signaling load, a difficulty to synchronize the broadcast transmission. On the other hand, the small number of broadcast channels enables the subscriber station to perform the handoff autonomously. To streamline the autonomous handoff decision process, several distinct sets of pilot identifiers and rules for transitioning among the sets are defined. To fully integrate broadcast services with the services provided by the cellular telephone systems in a subscriber environment, a methods for various handoff scenarios are analyzed.
    Type: Grant
    Filed: March 15, 2004
    Date of Patent: August 7, 2007
    Assignee: QUALCOMM, Incorporated
    Inventors: Tao Chen, Jun Wang, Ragulan Sinnarajah, Brian K. Butler, Edward G. Tiedemann, Jr.
  • Patent number: 7212503
    Abstract: Methods and apparatus are presented for implementing an improved Control-Hold Mode that reduces the load of the reverse link and reduces the battery consumption of remote stations. While a remote station is in the improved Control-Hold Mode, the circuitry that monitors the forward packet data channels and the associated control channels are turned off. Since the forward packet data channels and their associated control channels are not monitored, the operations of the reverse channels can be gated off to predetermined duty cycles, or set on intermittent transmission modes, or shut down completely. Transitions from the Control-Hold Mode to the Active Mode can be initiated by the remote station or by a base station. When a transition is initiated by a remote station, the remote station transmits a signaling message to a serving base station and then starts operating the feedback channels before actually receiving forward link signals.
    Type: Grant
    Filed: January 22, 2004
    Date of Patent: May 1, 2007
    Assignee: QUALCOMM, Incorporated
    Inventors: Sai Yiu Duncan Ho, Yongbin Wei, Ragulan Sinnarajah
  • Publication number: 20070091854
    Abstract: Techniques for minimizing call setup latency are disclosed. In one aspect, a channel assignment message is sent with a flag to direct the use of previously negotiated service parameters. This aspect eliminates the need for service negotiation messages. In another aspect, a channel assignment message is sent with an active set identifier instead of an active set and its parameters. This aspect reduces the transmission time of the channel assignment message. In yet another aspect, call setup without paging is facilitated by a mobile station (106) sending a pilot strength measurement message between active communication sessions, such that a channel assignment message can be used for mobile station terminated call setup without the need for mobile station paging and related messages.
    Type: Application
    Filed: November 30, 2006
    Publication date: April 26, 2007
    Applicant: QUALCOMM, INC.
    Inventors: Ragulan Sinnarajah, Edward Tiedemann, Ramin Rezaiifar, Jun Wang, Duncan Ho
  • Publication number: 20070093201
    Abstract: Method and apparatus for detection and selection of Wireless Local Area Network (WLAN) service. A cellular network may provide an advertisement for a WLAN, such as in an overhead signaling message. The advertisement may identify the Access Point(s) by an Extended Service Set Identifier (ESSID). The remote station may then scan for the WLAN service automatically or manually.
    Type: Application
    Filed: November 21, 2006
    Publication date: April 26, 2007
    Applicant: QUALCOMM, INC.
    Inventors: Raymond Hsu, Ragulan Sinnarajah
  • Publication number: 20070086392
    Abstract: Techniques for minimizing call setup latency are disclosed. In one aspect, a channel assignment message is sent with a flag to direct the use of previously negotiated service parameters. This aspect eliminates the need for service negotiation messages. In another aspect, a channel assignment message is sent with an active set identifier instead of an active set and its parameters. This aspect reduces the transmission time of the channel assignment message. In yet another aspect, call setup without paging is facilitated by a mobile station (106) sending a pilot strength measurement message between active communication sessions, such that a channel assignment message can be used for mobile station terminated call setup without the need for mobile station paging and related messages.
    Type: Application
    Filed: November 30, 2006
    Publication date: April 19, 2007
    Applicant: QUALCOMM, INC.
    Inventors: Ragulan Sinnarajah, Edward Tiedemann, Ramin Rezaiifar, Jun Wang, Duncan Ho
  • Publication number: 20070086393
    Abstract: Techniques for minimizing call setup latency are disclosed. In one aspect, a channel assignment message is sent with a flag to direct the use of previously negotiated service parameters. This aspect eliminates the need for service negotiation messages. In another aspect, a channel assignment message is sent with an active set identifier instead of an active set and its parameters. This aspect reduces the transmission time of the channel assignment message. In yet another aspect, call setup without paging is facilitated by a mobile station (106) sending a pilot strength measurement message between active communication sessions, such that a channel assignment message can be used for mobile station terminated call setup without the need for mobile station paging and related messages.
    Type: Application
    Filed: November 30, 2006
    Publication date: April 19, 2007
    Applicant: QUALCOMM, INC.
    Inventors: Ragulan Sinnarajah, Edward Tiedemann, Ramin Rezaiifar, Jun Wang, Duncan Ho
  • Publication number: 20070086391
    Abstract: Techniques for minimizing call setup latency are disclosed. In one aspect, a channel assignment message is sent with a flag to direct the use of previously negotiated service parameters. This aspect eliminates the need for service negotiation messages. In another aspect, a channel assignment message is sent with an active set identifier instead of an active set and its parameters. This aspect reduces the transmission time of the channel assignment message. In yet another aspect, call setup without paging is facilitated by a mobile station (106) sending a pilot strength measurement message between active communication sessions, such that a channel assignment message can be used for mobile station terminated call setup without the need for mobile station paging and related messages.
    Type: Application
    Filed: November 30, 2006
    Publication date: April 19, 2007
    Applicant: QUALCOMM, INC.
    Inventors: Ragulan Sinnarajah, Edward Tiedemann, Ramin Rezaiifar, Jun Wang, Duncan Ho
  • Publication number: 20070086390
    Abstract: Techniques for minimizing call setup latency are disclosed. In one aspect, a channel assignment message is sent with a flag to direct the use of previously negotiated service parameters. This aspect eliminates the need for service negotiation messages. In another aspect, a channel assignment message is sent with an active set identifier instead of an active set and its parameters. This aspect reduces the transmission time of the channel assignment message. In yet another aspect, call setup without paging is facilitated by a mobile station (106) sending a pilot strength measurement message between active communication sessions, such that a channel assignment message can be used for mobile station terminated call setup without the need for mobile station paging and related messages.
    Type: Application
    Filed: November 30, 2006
    Publication date: April 19, 2007
    Applicant: QUALCOMM, INC.
    Inventors: Ragulan Sinnarajah, Edward Tiedemann, Ramin Rezaiifar, Jun Wang, Duncan Ho
  • Patent number: 7184459
    Abstract: The call processing state machines defined by the CDMA standards (e.g., IS-95 and IS-2000) are modified to include a “traffic channel” substate indicative of the mobile station processing at least one active call. Call control (CC) state machines of various types are also provided to control the processing of the calls. To process one or more calls concurrently, a CC state machine is instantiated upon receiving an indication to process a particular call. The instantiated CC state machine is identified with, and used to control the processing of, the particular call. Upon receiving an indication to process an additional call, another CC state machine can be instantiated for the additional call. Each call to be processed can also be associated with a particular a service option connection, which includes information indicative of a set of parameters (e.g., the physical channels) to be used for data transmission.
    Type: Grant
    Filed: August 7, 2003
    Date of Patent: February 27, 2007
    Assignee: Qualcomm, Incorporated
    Inventors: Edward G. Tiedemann, Jr., Ragulan Sinnarajah
  • Patent number: 7180879
    Abstract: Techniques for minimizing call setup latency are disclosed. In one aspect, a channel assignment message is sent with a flag to direct the use of previously negotiated service parameters. This aspect eliminates the need for service negotiation messages. In another aspect, a channel assignment message is sent with an active set identifier instead of an active set and its parameters. This aspect reduces the transmission time of the channel assignment message. In yet another aspect, call setup without paging is facilitated by a mobile station (106) sending a pilot strength measurement message between active communication sessions, such that a channel assignment message can be used for mobile station terminated call setup without the need for mobile station paging and related messages.
    Type: Grant
    Filed: August 17, 2001
    Date of Patent: February 20, 2007
    Inventors: Ragulan Sinnarajah, Edward G. Tiedemann, Jr., Ramin Rezaiifar, Jun Wang, Duncan Ho
  • Publication number: 20060281466
    Abstract: Method and apparatus for hashing mobile stations to frequencies in a communication system. The method uses two-level hashing to assign a mobile station first to frequency band and then to a specific frequency within the frequency band. Embodiments allow for weights to be assigned to frequencies and mobiles hashed to the weighted frequencies. Weighting allows for a non-uniform distribution of mobile stations among frequencies to optimize system operating parameters.
    Type: Application
    Filed: March 1, 2006
    Publication date: December 14, 2006
    Inventors: Aziz Gholmieh, Peter Gaal, Ragulan Sinnarajah
  • Patent number: 7146130
    Abstract: Method and apparatus for detection and selection of Wireless Local Area Network (WLAN) service. A cellular network may provide an advertisement for a WLAN, such as in an overhead signaling message. The advertisement may identify the Access Point(s) by an Extended Service Set Identifier (ESSID). The remote station may then scan for the WLAN service automatically or manually.
    Type: Grant
    Filed: February 24, 2003
    Date of Patent: December 5, 2006
    Assignee: Qualcomm Incorporated
    Inventors: Raymond T. Hsu, Ragulan Sinnarajah
  • Publication number: 20060211445
    Abstract: A method for managing a point-to-point call initiated (702) between a wireless mobile station (114, 400) and a remote party while the mobile is receiving broadcast content via one or more multi-user forward-link broadcast channels (508). The mobile station notifies (704) the network (110) of preferences as to prescribed categories of operating conditions, such as whether to continue receiving the broadcast content, and election between the point-to-point call and the broadcast content should network resources be unable to conduct the point-to-point call and broadcast content concurrently. In accordance with the preferences, communications are conducted (706) in one of the following operating modes: (1) conducting the point-to-point call and discontinuing reception of the broadcast, (2) conducting the point-to-point call and continuing reception of the broadcast, (3) aborting completion of the point-to-point call and continuing reception of the broadcast.
    Type: Application
    Filed: May 17, 2006
    Publication date: September 21, 2006
    Inventors: Ragulan Sinnarajah, Jun Wang, Tao Chen
  • Publication number: 20060194605
    Abstract: A mobile station for wireless communication includes a control processor configured to generate a message for transmission on a reverse signaling channel, the message including a Station Class Mark field having a plurality of bits, a portion of the Station Class Mark field indicating that the mobile station is uniquely identified by a Mobile Station Equipment Identifier.
    Type: Application
    Filed: January 12, 2006
    Publication date: August 31, 2006
    Inventors: Ragulan Sinnarajah, Ravindra Patwardhan, Leslie Chan, Edward Tiedemann, Walid Hamdy, Baaziz Achour, Phillip Price, Bharat Shah, John Nasielski
  • Patent number: 7096024
    Abstract: A method for managing a point-to-point call initiated (702) between a wireless mobile station (114, 400) and a remote party while the mobile is receiving broadcast content via one or more multi-user forward-link broadcast channels (508). The mobile station notifies (704) the network (110) of preferences as to prescribed categories of operating conditions, such as whether to continue receiving the broadcast content, and election between the point-to-point call and the broadcast content should network resources be unable to conduct the point-to-point call and broadcast content concurrently. In accordance with the preferences, communications are conducted (706) in one of the following operating modes: (1) conducting the point-to-point call and discontinuing reception of the broadcast, (2) conducting the point-to-point call and continuing reception of the broadcast, (3) aborting completion of the point-to-point call and continuing reception of the broadcast.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: August 22, 2006
    Assignee: QUALCOMM, Incorporated
    Inventors: Ragulan Sinnarajah, Jun Wang, Tao Chen
  • Publication number: 20060094437
    Abstract: Method and apparatus for enhanced selection of a channel for use in redistributing mobile stations to various frequencies in a communication system. In one aspect, the method appends a redistribution alteration record to a common channel redistribution message. The redistribution alteration record alters the sequencing of the mobile station when selecting a channel in the common channel redistribution message.
    Type: Application
    Filed: October 21, 2005
    Publication date: May 4, 2006
    Inventors: Ragulan Sinnarajah, Jun Wang
  • Publication number: 20060023715
    Abstract: An apparatus for providing frame re-transmission in a broadcast communication system. Frame re-transmission is accomplished only when a predetermined number of negative acknowledgement messages are received with respect to one or more data frames. The predetermined number may vary in accordance with various operating parameters, such as the latency of the transmission and/or the number of wireless communication devices currently receiving a broadcast transmission.
    Type: Application
    Filed: September 14, 2005
    Publication date: February 2, 2006
    Inventors: Tao Chen, Nikolai Leung, Edward Tiedemann, Ragulan Sinnarajah
  • Patent number: 6983410
    Abstract: A method and apparatus for providing frame re-transmission in a broadcast communication system. Frame re-transmission is accomplished only when a predetermined number of negative acknowledgement messages are received with respect to one or more data frames. The predetermined number may vary in accordance with various operating parameters, such as the latency of the transmission and/or the number of wireless communication devices currently receiving a broadcast transmission.
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: January 3, 2006
    Assignee: Qualcomm, Incorporated
    Inventors: Tao Chen, Nikolai K. N. Leung, Edward G. Tiedemann, Ragulan Sinnarajah
  • Patent number: 6980820
    Abstract: A method and a system for providing signaling in cellular telephone system providing broadcast services to fully integrate broadcast services with the services provided by the cellular telephone systems. The signaling method coordinate interaction between an access network and the subscriber station to allowing the subscriber station to decode the broadcast service, to receive paging messages while receiving the broadcast service, to properly transition between operation states, and other functions known to one of ordinary skill in the art.
    Type: Grant
    Filed: August 20, 2001
    Date of Patent: December 27, 2005
    Assignee: Qualcomm Inc.
    Inventors: Ragulan Sinnarajah, Jun Wang, Paul E. Bender, Tao Chen, Edward G. Tiedemann, Jr.
  • Patent number: 6952411
    Abstract: Techniques for minimizing call setup latency are disclosed. In one aspect, multiple signaling messages are encapsulated and sent as a single message thus reducing the total delay incurred by sequential transmission. In one embodiment, an encapsulation message includes a field indicating the number of messages encapsulated therein. In one example, the encapsulation is performed at a Link Access Control (LAC) layer. Alternate embodiments may perform encapsulation at an alternate layer.
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: October 4, 2005
    Assignee: QUALCOMM, Incorporated
    Inventors: Ragulan Sinnarajah, Baaziz Achour, Jun Wang