Patents by Inventor Krishna Balachandran

Krishna Balachandran 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: 20120207037
    Abstract: Systems and methods are disclosed for reusing resources of a wireless network. Radio communications resources of the wireless network are divided into partitions. A system described herein allows access to resources in the first partition by a first set of users for primary communications on the first partition, and allows access to resources in the first partition by a second set of users for secondary communications on the first partition. The control system also allows access to resources in the second partition by the second set of users for primary communications on the second partition, and allows access to resources in the second partition by the first set of users for secondary communications on the second partition.
    Type: Application
    Filed: February 15, 2011
    Publication date: August 16, 2012
    Inventors: Krishna Balachandran, Joseph H. Kang, Kemal M. Karakayali, Kiran M. Rege
  • Patent number: 8243779
    Abstract: In a wireless communications system which hops from frequency to frequency, rather than hopping according to a fixed dwell interval and a pre-determined pseudo-random hop sequence, a quality-based frequency hopping methodology is defined in which a new frequency is hopped to when the channel quality on the current frequency degrades based on the measured value or values of one or more predetermined metrics that are associated with channel quality. When triggered to hop to a next frequency, the hop-to-frequency may be the next frequency in the pseudo-random hop sequence known to both the transmitter and receiver or, in order to improve the reliability of communications, may be determined based on channel quality measurements on different potential hop-to-frequencies.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: August 14, 2012
    Assignee: Alcatel Lucent
    Inventors: Krishna Balachandran, Joseph H Kang
  • Patent number: 8243637
    Abstract: A base station transmitter for a broadcast/multicast single frequency network may include a base station component configured to randomize a phase of the signal for the base station transmitter to transmit, wherein the base station transmitter is configured to transmit a signal having a frequency common to a frequency of a signal sent by another base station component in the network. A method for improving performance of single frequency networks may include transmitting single frequency signals from base stations with pseudo-random phases including in the signals, data that permits a receiver compatible with the network to synchronously replicate the pseudo-random phases used in the transmission of the single frequency signals.
    Type: Grant
    Filed: May 29, 2009
    Date of Patent: August 14, 2012
    Assignee: Alcatel Lucent
    Inventors: Kiran M. Rege, Krishna Balachandran, Joseph H. Kang, Kemal M. Karakayali
  • Patent number: 8190750
    Abstract: In a method for dynamically setting a content rate of a multimedia session for a client in a network, a proxy server receives a channel condition feedback message from a network controller and determines whether a receiver report message has been received from the client since a most recent previous channel condition feedback message. The channel condition feedback message includes current channel condition information for the network. The proxy server sends one of an extended feedback report message and a short feedback report message to a media server based on the determining step. The short feedback report message includes at least a maximum transmission rate parameter for the multimedia session. The extended feedback report message includes at least information contained in the receiver report message. The extended feedback report message may, in addition, include the maximum transmission rate parameter for the multimedia session.
    Type: Grant
    Filed: August 19, 2008
    Date of Patent: May 29, 2012
    Assignee: Alcatel Lucent
    Inventors: Krishna Balachandran, Doru Calin, Eunyoung Kim, Kiran M. Rege
  • Patent number: 8180283
    Abstract: The present invention provides a method involving a media server, a wireless network, and at least one media client associated with at least one air interface with the wireless network. The method includes accessing first information indicative of at least one state of the at least one media client. The first information is provided by the at least one media client. The method also includes accessing second information indicative of resources associated with the at least one air interface. The second information is provided by the wireless network. The method further includes providing at least one feedback parameter to the media server. The at least one feedback parameter is formed based on the first and second information.
    Type: Grant
    Filed: February 14, 2007
    Date of Patent: May 15, 2012
    Assignee: Alcatel Lucent
    Inventors: Krishna Balachandran, Doru Calin, Eunyoung Kim, Kiran M. Rege
  • Patent number: 8149831
    Abstract: In an application level multicast (ALM), multiple flows of data packets containing shared material are destined for different devices. A packet compression device is used to compress the data packets to reduce traffic load. This compression device includes a cache for recording the payloads of selected data packets which currently are not of record in the cache. If it is determined that the cache has therein a record of an identical version of the payload of a data packet, the compression device releases a compressed version of the data packet which includes a representation of the payload in lieu of the actual payload.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: April 3, 2012
    Assignee: Alcatel Lucent
    Inventors: Krishna Balachandran, Katherine Guo, Kiran Rege
  • Publication number: 20120071153
    Abstract: Among the various methods proposed to address interference problems in wireless networks, two promising ones are: Network Multi-Input-Multi-Output (often referred to as Network MIMO) decoding (which employs joint MIMO receiver processing of signals received at multiple antennas); and Multi-Cell Successive Interference Cancellation (MC-SIC). These methods have complementary strengths and limitations when implemented in a practical setting. The approach described herein attempts to combine the strengths of these two methods while working within the constraints imposed by practical implementations to provide a viable hybrid solution.
    Type: Application
    Filed: September 17, 2010
    Publication date: March 22, 2012
    Applicant: Alcatel-Lucent USA Inc.
    Inventors: Krishna Balachandran, Joseph H. Kang, Kemal M. Karakayali, Kiran M. Rege
  • Patent number: 8111668
    Abstract: In a wireless communication system, there is a method of generating and transmitting signaling information from a user, where user control information may be appended as a header to a data block, and the data block and header may be encoded and transmitted as a signaling message from the user. In a method of scheduling a user for transmitting information, a signaling message, which may include user control information, is received from a user. A scheduling grant message that may include an allocated data rate may be transmitted in response to the received signaling message. The user control information may include one or more of buffer status information of the user, reverse pilot channel transmit power information and data related to a soft handoff (SHO) status of the user.
    Type: Grant
    Filed: February 14, 2003
    Date of Patent: February 7, 2012
    Assignee: Alcatel Lucent
    Inventors: Krishna Balachandran, Arnab Das, Farooq Ullah Khan, Ashwin Sampath, Hsuan-Jung Su
  • Patent number: 8081609
    Abstract: The present invention provides a method involving a media server, a wireless access network, at least one media client, and a proxy server. The method includes accessing, at the proxy server, at least one message including information indicating impending establishment of a media session between the media server and said at least one media client. The method also includes providing, from the proxy server, information indicating the impending establishment of the media session and a request to receive feedback associated with the media session. The method further includes receiving, at the proxy server, feedback associated with the media session in response to providing the request to receive feedback associated with the media session.
    Type: Grant
    Filed: February 14, 2007
    Date of Patent: December 20, 2011
    Assignee: Alcatel Lucent
    Inventors: Krishna Balachandran, Doru Calin, Eunyoung Kim, Kiran M. Rege
  • Patent number: 8027290
    Abstract: Methods for jointly determining tones, power, scheduling and routing of links in a multi-carrier, multi-hop network to achieve certain desired throughput objectives between source and destination nodes. The methods effectively enhance or optimize throughput received by each destination router under node traffic constraints such as power, scheduling and flow constraints that apply to each link between each of a plurality of nodes within the mesh network.
    Type: Grant
    Filed: June 15, 2007
    Date of Patent: September 27, 2011
    Assignee: Alcatel Lucent
    Inventors: Krishna Balachandran, Joseph H. Kang, Kemal Mehmet Karakayali, Muralidharan Sampath Kodialam
  • Patent number: 8023552
    Abstract: In an ad hoc wireless network, for purposes of neighbor discovery, a transmitting node transmits a beacon within a timeslot and at a frequency that varies from timeslot-to-timeslot according to one or more associated and known pseudo-random or cyclical frequency hopping sequences. When, during a timeslot, the frequency hopping sequence would select a beacon frequency that if transmitted would violate spectrum policy that is in place during that timeslot, then, during that timeslot, a beacon is not transmitted during that timeslot. During each timeslot, a neighbor receiving node attempts to detect and decode a transmitted beacon at a frequency specified by the frequency hopping sequence that it expects a transmitting node to be using. When a receiving node successfully detects and decodes a beacon transmitted by a transmitting node, neighbor discovery between the transmitting and receiving nodes is achieved.
    Type: Grant
    Filed: September 22, 2006
    Date of Patent: September 20, 2011
    Assignee: Alcatel Lucent
    Inventors: Krishna Balachandran, Joseph H Kang
  • Publication number: 20110225317
    Abstract: In a method for dynamically setting a content rate of a multimedia session for a client in a network, a proxy server receives a channel condition feedback message from a network controller and determines whether a receiver report message has been received from the client since a most recent previous channel condition feedback message. The channel condition feedback message includes current channel condition information for the network. The proxy server sends one of an extended feedback report message and a short feedback report message to a media server based on the determining step. The short feedback report message includes at least a maximum transmission rate parameter for the multimedia session. The extended feedback report message includes at least information contained in the receiver report message. The extended feedback report message may, in addition, include the maximum transmission rate parameter for the multimedia session.
    Type: Application
    Filed: March 16, 2011
    Publication date: September 15, 2011
    Inventors: Krishna Balachandran, Doru Calin, Eunyoung Kim, Kiran M. Rege
  • Patent number: 7990931
    Abstract: Information is transmitted over selected, Orthogonal Frequency Division Multiplexed (OFDM) sub-channels to avoid frequencies with unacceptable congestion, noise or interference levels. Using frequency hopping, selected non-contiguous OFDM sub-channels used for transmission may vary with time. Once a group of OFDM sub-channels is selected, a power level and modulation technique may also be selected based on channel quality.
    Type: Grant
    Filed: January 19, 2010
    Date of Patent: August 2, 2011
    Assignee: Alcatel-Lucent USA Inc.
    Inventors: Krishna Balachandran, Tingfang Ji, Joseph H. Kang, Wei Luo, Hsuan-Jung Su
  • Patent number: 7970425
    Abstract: A push-to-talk (“PTT”) group call system, for use as, e.g., a public safety wireless network, includes a CDMA-based 1x-EVDO radio access network operably connected to a PTT server over an IP network. The radio access network includes base stations for radio communications with a number of distributed mobile stations. In carrying out wireless communications, the group call system combines IP-based voice and other real-time multimedia services with the 1x-EVDO radio access network's Broadcast Multicast Service. This allows a number of users to receive the same copy of an IP-based media stream for point-to-multipoint, group transmissions. To reduce call setup times, the group call system uses “standing” call groups, which are ongoing group communication channels pre-established between the PTT server and authorized group users. Thus, mobile stations link to one or more standing call groups of interest upon power-up, prior to users speaking.
    Type: Grant
    Filed: August 30, 2005
    Date of Patent: June 28, 2011
    Assignee: Alcatel-Lucent USA Inc.
    Inventors: Krishna Balachandran, Kenneth C. Budka, Joseph H. Kang
  • Publication number: 20110124289
    Abstract: Embodiments are described herein to provide improvements to known network interference cancellation techniques. One general approach involves a receiver attempting to decode (801) a received signal which includes signaling from a wireless device transmission and at least one interfering transmission. If the receiver is unsuccessful in attempting to decode the received signal, decoded signaling that corresponds to the interfering transmission is requested (802). The receiver then uses the decoded signaling to decode (803) the received signal.
    Type: Application
    Filed: November 20, 2009
    Publication date: May 26, 2011
    Inventors: Krishna Balachandran, Joseph H. Kang, Kemal M. Karakayali, Kiran M. Rege
  • Publication number: 20110116503
    Abstract: In an application level multicast (ALM), multiple flows of data packets containing shared material are destined for different devices. A packet compression device is used to compress the data packets to reduce traffic load. This compression device includes a cache for recording the payloads of selected data packets which currently are not of record in the cache. If it is determined that the cache has therein a record of an identical version of the payload of a data packet, the compression device releases a compressed version of the data packet which includes a representation of the payload in lieu of the actual payload.
    Type: Application
    Filed: November 19, 2009
    Publication date: May 19, 2011
    Inventors: Krishna Balachandran, Katherine Guo, Kiran Rege
  • Publication number: 20110055403
    Abstract: In one embodiment, a method of sending data from a first node participating in a session of a collaborative application via a wireless network to a plurality of second nodes participating in the session of the collaborative application via a wired network includes generating a plurality of data streams corresponding to the plurality of second nodes at the first node, reducing the plurality of data streams to a single stream from among the plurality of data streams, and sending the single data stream to a collaboration agent associated with the first node and connected to the wired network. In another embodiment instances of the collaborative application are run at both the first node and the collaboration agent. In yet another embodiment, an instance of the collaborative application is run only at the collaboration agent which is connected to the first node via a bi-directional windows sharing link.
    Type: Application
    Filed: September 1, 2009
    Publication date: March 3, 2011
    Inventors: Krishna Balachandran, Katherine H. Guo, Kiran M. Rege
  • Patent number: 7873067
    Abstract: In a floor control system for a network, a floor control server controls a floor-based application for communications between multiple participant terminals. The server carries out a floor determination process that includes an adaptive waiting function. Upon receiving an initial floor request message, the server waits for additional requests before determining the floor winner. The wait time is a function of the floor request load. When the system is lightly loaded, the wait time is generally small. For heavier request loads, the wait time is generally longer, to ensure that a reasonable number of requests are received before awarding the floor. The wait time may be limited by a maximum wait time, which is a function of the floor request load. If a designated number of floor requests is received before the maximum wait time expires, a temporary floor winner is granted the floor if its priority is sufficiently high.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: January 18, 2011
    Assignee: Alcatel-Lucent USA Inc.
    Inventors: Krishna Balachandran, Thomas P. Chu, Joseph H. Kang
  • Publication number: 20100302984
    Abstract: A base station transmitter for a broadcast/multicast single frequency network may include a base station component configured to randomize a phase of the signal for the base station transmitter to transmit, wherein the base station transmitter is configured to transmit a signal having a frequency common to a frequency of a signal sent by another base station component in the network. A method for improving performance of single frequency networks may include transmitting single frequency signals from base stations with pseudo-random phases including in the signals, data that permits a receiver compatible with the network to synchronously replicate the pseudo-random phases used in the transmission of the single frequency signals.
    Type: Application
    Filed: May 29, 2009
    Publication date: December 2, 2010
    Inventors: Kiran M. Rege, Krishna Balachandran, Joseph H. Kang, Kemal M. Karakayali
  • Publication number: 20100218065
    Abstract: A method for implementation of HARQ between a transmitting node and a receiving node in a communication network is provided. HARQ processes may be selected from a list for instantiation according to a policy that may deviate from strict first-in, first-out processing of packets. The greater flexibility that this affords may lead to improved efficiency in the use of transmission resources.
    Type: Application
    Filed: February 25, 2009
    Publication date: August 26, 2010
    Inventors: Krishna Balachandran, Nandu Gopalakrishnan, Joseph Kang, Achilles Kogiantis