Patents by Inventor Ramin Rezaiifar

Ramin Rezaiifar 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).

  • Publication number: 20090290652
    Abstract: In a wireless communication system where different frequency bands are deployed to generate various communication zones, pilot signal set management for a plurality of pilot signals generated from an additional coverage zone is based on identifying a preselected signal set from the plurality of pilot signals and determining whether a predetermined criterion is met.
    Type: Application
    Filed: May 15, 2009
    Publication date: November 26, 2009
    Applicant: QUALCOMM Incorporated
    Inventors: Ramin Rezaiifar, Christopher G. Lott, Donna Ghosh, Peter J. Black, Rashid Ahmed A. Attar
  • Publication number: 20090285158
    Abstract: Techniques for dynamically varying coverage in a multi-carrier communication system are described. A sector may operate on multiple carriers. The sector may vary coverage on a given carrier k based on its load, so that less interference may be caused to other sectors when the sector load is light. In one design, the sector may communicate on a first carrier at a first transmit power level and on a second carrier at a second transmit power level equal to or lower than the first transmit power level. The sector may vary the second transmit power level based on its load to vary the coverage of the second carrier. The sector may reduce the second transmit power level to zero or a low level if the sector load is light. The sector may also vary the second transmit power level based on a function of sector load or a switching pattern.
    Type: Application
    Filed: May 14, 2009
    Publication date: November 19, 2009
    Applicant: QUAL COMM Incorporated
    Inventors: Ramin Rezaiifar, Peter J. Black
  • Publication number: 20090285159
    Abstract: Techniques for selecting a serving sector for a terminal based on server selection information in order to balance the load of sectors in a wireless communication system are described. The server selection information for each sector may be set based on the load of the sector and may be used to rank the sector for selection as a serving sector. In one design, a terminal may receive server selection information for multiple sectors. The server selection information for each sector may include an offset used to adjust a measurement made by the terminal for the sector, a priority of the sector for selection as a serving sector, a DRCLock set based on the load of the sector, etc. The terminal may determine received signal qualities of the sectors. The terminal may then select one of the sectors as a serving sector based on the server selection information and the received signal qualities of the sectors.
    Type: Application
    Filed: May 14, 2009
    Publication date: November 19, 2009
    Applicant: QUALCOMM Incorporated
    Inventors: Ramin Rezaiifar, Rashid Ahmed A. Attar, Christopher G. Lott
  • Publication number: 20090279482
    Abstract: Techniques for enhanced backhaul flow control are provided. In an exemplary embodiment, a backhaul control system is described that comprises a base station controller (BSC), a backhaul network, and a base transceiver station (BTS). Each is responsive to data and messaging transmitted and received. In one aspect, the BTS includes a queue and a controller. The amount of data in a queue is adjusted by a controller based upon calculating a target queue size value. The controller non-uniformly adjusts the amount of data in a queue based upon a target queue size value which is based upon communication system parameters. The target queue size and amount of data in a queue is adjusted so as to reduce buffer underrun, decrease system latency, and increase communication system throughput.
    Type: Application
    Filed: May 6, 2009
    Publication date: November 12, 2009
    Applicant: QUALCOMM Incorporated
    Inventors: Peerapol Tinnakornsrisuphap, Mehmet Yavuz, Ramin Rezaiifar, Vikram Gupta
  • Publication number: 20090268668
    Abstract: Local IP access is provided in a wireless network to facilitate access to one or more local services. In some implementations, different IP interfaces are used for accessing different services (e.g., local services and operator network services). A list that maps packet destinations to IP interfaces may be employed to determine which IP interface is to be used for sending a given packet. In some implementations an access point provides a proxy function (e.g., a proxy ARP function) for an access terminal. In some implementations an access point provides an agent function (e.g., a DHCP function) for an access terminal. NAT operations may be performed at an access point to enable the access terminal to access local services. In some aspects, an access point may determine whether to send a packet from an access terminal via a protocol tunnel based on the destination of the packet.
    Type: Application
    Filed: April 21, 2009
    Publication date: October 29, 2009
    Applicant: QUALCOMM Incorporated
    Inventors: Peerapol Tinnakornsrisuphap, Fatih Ulupinar, John W. Nasielski, Jun Wang, Parag A. Agashe, Rajarshi Gupta, Ramin Rezaiifar
  • Patent number: 7593408
    Abstract: A method and apparatus for resolving ambiguity in reception of multiple retransmitted frames includes ascertaining for each data frame received from a transmitter whether the frame is a retransmitted frame. If the frame is a retransmitted frame, the frame may be stored in a resequencing buffer. If an abort timer associated with the second round of retransmission has been set for the retransmitted frame, an associated negative-acknowledgment-list (NAK-list) entry is not removed from a NAK list until the abort timer has expired. If the abort timer has not been set for the retransmitted frame, the associated NAK-list entry is removed from the NAK list. The method and apparatus may reside in a transport function in which a transmitter sends data frames to a receiver in accordance with the Radio Link Protocol interface. The transport function may reside in, e.g., a data-capable cellular or satellite-based base station and subscriber unit.
    Type: Grant
    Filed: April 18, 2006
    Date of Patent: September 22, 2009
    Assignee: QUALCOMM Incorporated
    Inventors: Ramin Rezaiifar, Nikolai K. N. Leung
  • Publication number: 20090219816
    Abstract: Techniques for managing the load of an access channel in a wireless communication system are described. In an aspect, the load of the access channel may be controlled by having each terminal regulates its use of the access channel (e.g., its rate of system access) based on a rate control algorithm (e.g., token bucket). The rate control algorithm may maintain information on past activities of a terminal and may regulate the use of the access channel by the terminal based on its past activities in order to control the access channel load and achieve fairness. The system may determine at least one parameter value for the rate control algorithm based on load conditions and may broadcast the at least one parameter value to terminals. Each terminal may regulate its use of the access channel based on the at least one parameter value received from the system.
    Type: Application
    Filed: February 26, 2009
    Publication date: September 3, 2009
    Applicant: QUALCOMM Incorporated
    Inventor: Ramin Rezaiifar
  • Publication number: 20090196294
    Abstract: Techniques for generating and transmitting packets on multiple links in a wireless communication system are described. In one aspect, a transmitter generates new packets for the multiple links based on the likelihood of each link being available. The transmitter determines the likelihood of each carrier being available based on whether or not there is a pending packet on that carrier and, if yes, the number of subpackets sent for the pending packet. The transmitter generates new packets such that packets for links progressively less likely to be available contain data units with progressively higher sequence numbers. The transmitter determines whether each link is available and sends a packet on each link that is available. In another aspect, the transmitter generates and sends new packets in a manner to ensure in-order transmission. In one design, the transmitter generates new packets for each possible combination of links that might be available.
    Type: Application
    Filed: May 2, 2008
    Publication date: August 6, 2009
    Applicant: QUALCOMM Incorporated
    Inventors: Peter John Black, Ramin Rezaiifar
  • Patent number: 7561555
    Abstract: In accordance with the present disclosure, a method of routing data packets between an IP network and a radio access network may include allocating an IP address to an International Mobile Station Identity (IMSI). The method may also include purging a foreign agent of table entries associatinathe IP address to other IMSI values.
    Type: Grant
    Filed: March 27, 2006
    Date of Patent: July 14, 2009
    Assignee: Qualcomm Incorporated
    Inventors: Nischal Abrol, Ramin Rezaiifar
  • Publication number: 20090163209
    Abstract: Techniques to determine whether or not a terminal is under the coverage of a current wireless communication system (e.g., a packet data system) and to switch from the current system to another wireless communication system (e.g., a voice/data system). In one method, at least one measurement of at least one parameter for at least one base station in the current system is initially obtained. The measurement(s) may be SNR measurements. A metric is derived based on the measurement(s) and used (typically along with a metric threshold and a timer) to determine whether or not the terminal is within the coverage of the current system. A switch to another system is initiated if the terminal is deemed to be outside the coverage of the current system. The two systems provide at least one common service (e.g., packet data service).
    Type: Application
    Filed: October 10, 2008
    Publication date: June 25, 2009
    Applicant: QUALCOMM Incorporated
    Inventors: Peter J. Black, Ramin Rezaiifar, Thunyachate Ekvetchavit
  • Patent number: 7542482
    Abstract: Method for segmented message transmission wherein each message is first divided into segments and the segments are fragmented. A segment parameter is applied to each segment, and a segment identifier to each fragment. The fragments are provided to a lower level for preparation into frames for transmission. One embodiment is applied to the transmission of short duration messages, such as control messages.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: June 2, 2009
    Assignee: QUALCOMM Incorporated
    Inventors: Lorenzo Casaccia, Ramin Rezaiifar, Edward G. Tiedemann, Jr.
  • Patent number: 7539507
    Abstract: In a multiple-access network, network access terminals conduct peer-to-peer communications on reverse link channels of the network.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: May 26, 2009
    Assignee: QUALCOMM Incorporated
    Inventors: Matthew S. Grob, Rashid A. Attar, Henry D. Pfister, Klein S. Gilhousen, Ramin Rezaiifar
  • Patent number: 7519044
    Abstract: A channel structure for use in communication systems. Two sets of physical channels, one for the forward link and another for the reverse link, are utilized to facilitate communication of a variety of logical channels. The physical channels comprise data and control channels. In the exemplary embodiment, the data channels comprise fundamental channels which are used to transmit voice traffic, data traffic, high speed data, and other overhead information and supplemental channels which are used to transmit high speed data. The fundamental channels can be released when the remote stations are idle to more fully utilized the available capacity. The control channels are used to transmit paging and control messages and scheduling information.
    Type: Grant
    Filed: February 14, 2000
    Date of Patent: April 14, 2009
    Assignee: QUALCOMM Incorporated
    Inventors: Ramin Rezaiifar, Yu-Chen Jou, Edward G. Tiedeman, Jr.
  • Patent number: 7499698
    Abstract: Techniques for synchronization of stored service parameters are disclosed. In one aspect, a configuration identifier is transmitted from a mobile station to a base station, and compared with an identifier generated in the base station. If the identifiers match, the configuration is used for communication. In another aspect, the identifier is generated by selecting an identifier associated with a configuration from a configuration table. In yet another aspect, the identifier is generated by computing a cyclic redundancy check (CRC) of the configuration. Various other aspects are also presented. These aspects have the benefit of preventing attempted use of unsynchronized stored service parameters and associated call setup failures and subsequent renegotiation, with the net effect of reducing call setup time and more efficient use of system resources.
    Type: Grant
    Filed: January 28, 2002
    Date of Patent: March 3, 2009
    Assignee: Qualcomm Incorporated
    Inventors: Sai Yiu Duncan Ho, Edward G. Tiedemann, Jr., Jun Wang, Ragulan Sinnarajah, Ramin Rezaiifar
  • Publication number: 20090047931
    Abstract: In some aspect restricted access nodes are assigned to a designated common channel while access terminals that are in active communication with a macro access node may selectively be assigned to the designated channel. In some aspect an access terminal associated with macro access node may perform a handoff to a different carrier when the access terminal is in the vicinity of a coverage area of a restricted access node. In some aspect an access terminal associated with a macro access node may perform a handoff to a different carrier based on location information. In some aspect access to a restricted access node is controlled based on policy and/or based on operation of an access terminal associated with the restricted access node.
    Type: Application
    Filed: August 13, 2008
    Publication date: February 19, 2009
    Applicant: QUALCOMM Incorporated
    Inventors: Sanjiv Nanda, Ramin Rezaiifar, Mehmet Yavuz
  • Publication number: 20090046632
    Abstract: In some aspect restricted access nodes are assigned to a designated common channel while access terminals that are in active communication with a macro access node may selectively be assigned to the designated channel. In some aspect an access terminal associated with macro access node may perform a handoff to a different carrier when the access terminal is in the vicinity of a coverage area of a restricted access node. In some aspect an access terminal associated with a macro access node may perform a handoff to a different carrier based on location information. In some aspect access to a restricted access node is controlled based on policy and/or based on operation of an access terminal associated with the restricted access node.
    Type: Application
    Filed: August 13, 2008
    Publication date: February 19, 2009
    Applicant: QUALCOMM Incorporated
    Inventors: Sanjiv Nanda, Ramin Rezaiifar, Mehmet Yavuz
  • Patent number: 7450943
    Abstract: Techniques to determine whether or not a terminal is under the coverage of a current wireless communication system (e.g., a packet data system) and to switch from the current system to another wireless communication system (e.g., a voice/data system). In one method, at least one measurement of at least one parameter for at least one base station in the current system is initially obtained. The measurement(s) may be SNR measurements. A metric is derived based on the measurement(s) and used (typically along with a metric threshold and a timer) to determine whether or not the terminal is within the coverage of the current system. A switch to another system is initiated if the terminal is deemed to be outside the coverage of the current system. The two systems provide at least one common service (e.g., packet data service).
    Type: Grant
    Filed: February 12, 2003
    Date of Patent: November 11, 2008
    Assignee: QUALCOMM Incorporated
    Inventors: Peter J. Black, Ramin Rezaiifar, Thunyachate Ekvetchavit
  • Publication number: 20080227428
    Abstract: Methods, apparatus and media for receiving emergency broadcast information in a broadcast-multicast service of a communication system. The methods, apparatus and media include scheduling a broadcast of emergency broadcast information in designated control channel cycles for designated subscriber stations. The control channel cycles are transmitted with the designated control channel cycles including the emergency broadcast information. Subscriber stations awake according to their designated control channel cycle and receive the transmission of their designated control channel cycle on a broadcast-multicast service. The subscriber station determines if emergency broadcast information is in the control channel cycle assigned to the subscriber station and responds accordingly.
    Type: Application
    Filed: January 31, 2008
    Publication date: September 18, 2008
    Applicant: QUALCOMM INCORPORATED
    Inventors: Ramin Rezaiifar, Rashid A. Attar
  • Patent number: 7417976
    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: November 30, 2006
    Date of Patent: August 26, 2008
    Assignee: Qualcomm Incorporated
    Inventors: Ragulan Sinnarajah, Edward G. Tiedemann, Jr., Ramin Rezaiifar, Jun Wang, Duncan Ho
  • Publication number: 20080186920
    Abstract: Techniques to support handover of a terminal from a source base station to a target base station are described. In one design, a determination is made whether a change in personality is requested by the terminal. If the answer is ‘Yes’, then the personality of the terminal may be switched by sending one or more appropriate messages. The connection and RLP for the terminal may be reset due to the change in personality. A buffer of data reported by the source base station as being served to the terminal (e.g., no NAK was sent) may be saved by a BSC/PCF. The buffer of data may be sent to the target base station when handover occurs. New data may thereafter be sent to the target base station. This buffer of duplicate data may avoid both loss of data and retransmission timeout by TCP during the handover.
    Type: Application
    Filed: February 4, 2008
    Publication date: August 7, 2008
    Applicant: QUALCOMM Incorporated
    Inventors: Ramin Rezaiifar, Peter Black