Patents by Inventor Srikanth Gummadi
Srikanth Gummadi 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).
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Publication number: 20120314589Abstract: Methods and apparatus are provided for operating in a first RAN at a working frequency, determining a priority of measurement tasks enabled by the first RAN, and dynamically scheduling the tasks according to the priority. For certain aspects, the first RAN may be a TD-SCDMA network. The measurement tasks are intended to measure at least one parameter of a serving cell in the first RAN on a primary frequency, at least one cell in the first RAN on at least one frequency other than the primary frequency, one or more cells in at least one RAN other than the first RAN (e.g., a GSM network) or any combination thereof. This dynamic assignment allows the UE to make scheduling decisions on which frequencies and RANs to measure, as well as how often these frequencies and RANs are measured, thereby providing for more efficient use of idle slots over conventional haphazard scheduling.Type: ApplicationFiled: June 9, 2011Publication date: December 13, 2012Inventors: Qingxin Chen, Aamod Dinkar Khandekar, Srikanth Gummadi, Shan Qing
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Patent number: 8331309Abstract: A configuration for downlink signals in a wireless communication system, methods of configuring the downlink signals, apparatus for generating the downlink signals, and apparatus for receiving and processing the downlink signals are described herein. Downlink signals in a wireless communication system are reconfigured in series of frames, with each frame carrying a preamble that provides fast cell search and system acquisition. In particular, the preamble includes a primary preamble and a secondary preamble, where the primary preamble is common to all sectors in a base station and all base stations in a system and the secondary preamble is effectively unique to each base station, and may be further distinguished based on a sector basis.Type: GrantFiled: March 9, 2009Date of Patent: December 11, 2012Assignee: Wi-LAN, Inc.Inventors: Gene Marsh, Srikanth Gummadi, William Burchill, Michael Wengler
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Publication number: 20120294274Abstract: Systems and methods of pre-allocating identifiers to wireless devices for use in requesting resources over a random access channel are described. A wireless communication system includes a random access channel over which wireless devices can anonymously send requests for resources. The base stations receiving and processing the anonymous requests reduces the probability of random access channel collisions and conserves the resources needed to support the anonymous requests by pre-allocating one or more codes to select wireless devices. The wireless devices having the pre-allocated codes can transmit a particular code over the random access channel as a request for resources that uniquely identifies the requester.Type: ApplicationFiled: August 2, 2012Publication date: November 22, 2012Applicant: WI-LAN, INC.Inventors: Yair Bourlas, Adam E. Newham, Lei Wang, Srikanth Gummadi
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Patent number: 8290447Abstract: Methods and apparatus for reducing transmit emissions are described herein. The transmit out of band emissions in an adjacent band can be reduced while complying with existing wireless communication standards through utilization of one or more of reduced transmit bandwidth, transmit operating band offset, and channel index remapping. The transceiver can support a receive operating band that is substantially adjacent to a band edge. The transmit operating band can be offset from an adjacent frequency band, and can use a narrower operating band than is supported by the receiver. The transmit baseband signal can have a reduced bandwidth to reduce the amount of noise. The frequency offset can introduce a larger transition band between the transmit operating band edges and the adjacent frequency band of interest. The transceiver can remap channel assignments to compensate for the frequency offset such that the frequency offset introduced in the transmitter is transparent to channel allocation.Type: GrantFiled: January 19, 2007Date of Patent: October 16, 2012Assignee: Wi-LAN Inc.Inventors: Todd Sutton, Srikanth Gummadi, Walid Hosseini, Lei Wang
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Patent number: 8270352Abstract: Methods and apparatuses for reducing the overhead associated with transmitting MAPs are provided by grouping client stations in different constellations into one of two or more groups/allocations based partially upon their respective channel conditions. As a result of grouping, client stations within each group/allocation share a single resource allocation and in addition, the different groups of client stations can be scheduled such that variable modulation repeat-coding schemes can be implemented for map transmissions to each group, thereby reducing the repetition rates and overhead associated with map transmissions.Type: GrantFiled: April 9, 2008Date of Patent: September 18, 2012Assignee: Wi-LAN Inc.Inventors: Hari Sankar, Srikanth Gummadi
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Patent number: 8259688Abstract: Systems and methods of pre-allocating identifiers to wireless devices for use in requesting resources over a random access channel are described. A wireless communication system includes a random access channel over which wireless devices can anonymously send requests for resources. The base stations receiving and processing the anonymous requests reduces the probability of random access channel collisions and conserves the resources needed to support the anonymous requests by pre-allocating one or more codes to select wireless devices. The wireless devices having the pre-allocated codes can transmit a particular code over the random access channel as a request for resources that uniquely identifies the requester.Type: GrantFiled: September 1, 2006Date of Patent: September 4, 2012Assignee: Wi-LAN Inc.Inventors: Yair Bourlas, Adam E. Newham, Lei Wang, Srikanth Gummadi
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Patent number: 8238958Abstract: The subject matter disclosed herein provides methods and apparatus, including computer program products, for selecting a modulation and coding scheme. In one aspect, there is provided a method. The method may receive information representative of a first normalized channel characteristic power associated with a downlink and receiving information representative of a second normalized channel characteristic power associated with an uplink. A predicted normalized channel characteristic power of the uplink may be determined based on the first normalized channel characteristic power and the second normalized channel characteristic power. Related systems, apparatus, methods, and/or articles are also described.Type: GrantFiled: April 11, 2008Date of Patent: August 7, 2012Assignee: Wi-LAN Inc.Inventors: Yair Bourlas, Srikanth Gummadi, Xiaolong Huang
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Patent number: 8229437Abstract: Systems and methods of pre-allocating identifiers to wireless devices for use in requesting resources over a random access channel are described. A wireless communication system includes a random access channel over which wireless devices can anonymously send requests for resources. The base stations receiving and processing the anonymous requests reduces the probability of random access channel collisions and conserves the resources needed to support the anonymous requests by pre-allocating one or more codes to select wireless devices. The wireless devices having the pre-allocated codes can transmit a particular code over the random access channel as a request for resources that uniquely identifies the requester.Type: GrantFiled: July 11, 2011Date of Patent: July 24, 2012Assignee: Wi-LAN, Inc.Inventors: Yair Bourlas, Adam E. Newham, Lei Wang, Srikanth Gummadi
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Patent number: 8204442Abstract: Methods and apparatus are described for mitigating intercell interference in wireless communication systems utilizing substantially the same operating frequency band across multiple neighboring coverage areas. The operating frequency band may be shared across multiple neighboring or otherwise adjacent cells, such as in a frequency reuse one configuration. The wireless communication system can synchronize one or more resource allocation regions or zones across the multiple base stations, and can coordinate a permutation type within each resource allocation zone. The base stations can coordinate a pilot configuration in each of a plurality of coordinated resource allocation regions. Subscriber stations can be assigned resources in a coordinated resource allocation region based on interference levels. A subscriber station can determine a channel estimate for each of multiple base stations in the coordinated resource allocation region to mitigate interference.Type: GrantFiled: December 3, 2008Date of Patent: June 19, 2012Assignee: Wi-LAN Inc.Inventors: Hari Sankar, Ron Porat, Danjie Pan, Wee Peng Goh, Srikanth Gummadi, Lei Wang
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Publication number: 20120140730Abstract: An advanced technology frame structure is described herein. The advanced technology frame structure can enhance a first technology frame structure in dimensions of time, frequency, or a combination of time and frequency. A second technology frame structure time division multiplexes second technology subframes with the first technology downlink and uplink subframes. The first technology downlink subframe can be divided into a first technology downlink subframe and one or more second technology downlink subframes. Similarly, the first technology uplink subframe can be divided into a first uplink subframe and one or more second technology uplink subframes. These principles can be expanded upon and can be applied in many communication systems.Type: ApplicationFiled: February 13, 2012Publication date: June 7, 2012Applicant: WI-LAN, Inc.Inventors: Roger Marks, Lei Wang, Yair Bourlas, Srikanth Gummadi, Kenneth Stanwood, Ron Porat
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Publication number: 20120069753Abstract: Channel estimation at a user equipment includes estimating channel quality of at least one channel. A first algorithm or a second algorithm is selected based on the estimated channel quality. Channel estimation is performed based on the selected algorithm. The first algorithm may be a midamble multiplication-based algorithm. The second algorithm may be a midamble division algorithm. Channel estimation may also include estimating noise of a channel and adaptively setting a threshold based on the estimated noise to refine the channel estimation. The estimating channel quality, selecting of a first or second algorithm and channel estimation may be performed iteratively for contributing signals on a channel. An adaptive threshold may be modified across iterations. The channel estimation may also include determining a delay profile of a channel to refine the channel estimation.Type: ApplicationFiled: July 1, 2011Publication date: March 22, 2012Applicant: QUALCOMM IncorporatedInventors: Hari Sankar, Wenjun Li, Farrokh Abrishamkar, Srikanth Gummadi
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Publication number: 20120069759Abstract: Methods and apparatus for identifying a subscriber station which is in motion, determining a mobility metric indicative of a level of mobility of the subscriber station and varying or updating one or more operating parameters based on the mobility metric. An apparatus can determine a measure of mobility based on one or a combination of a plurality of factors, such as variations in signal strength, variations in a channel estimate, or variations in phase or frequency of a particular signal or signal component. The one or more measures of mobility can be combined to form a single measure of mobility, the measure of mobility can be quantized to a predetermined number of mobility levels and one or more operating parameters can be varied or adjusted based on the mobility level.Type: ApplicationFiled: November 21, 2011Publication date: March 22, 2012Applicant: Wi-LAN, Inc.Inventors: Srikanth Gummadi, Ron Porat, Todd R. Sutton
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Patent number: 8139537Abstract: An advanced technology frame structure is described herein. The advanced technology frame structure can enhance a first technology frame structure in dimensions of time, frequency, or a combination of time and frequency. A second technology frame structure time division multiplexes second technology subframes with the first technology downlink and uplink subframes. The first technology downlink subframe can be divided into a first technology downlink subframe and one or more second technology downlink subframes. Similarly, the first technology uplink subframe can be divided into a first uplink subframe and one or more second technology uplink subframes. These principles can be expanded upon and can be applied in many communication systems.Type: GrantFiled: November 5, 2008Date of Patent: March 20, 2012Assignee: Wi-LAN, Inc.Inventors: Roger Marks, Lei Wang, Yair Bourlas, Srikanth Gummadi, Kenneth Stanwood, Ron Porat
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Publication number: 20120044829Abstract: Enhanced frame preambles facilitate co-channel co-existence in a wireless communication environment by having at least one preamble characteristic that connotes channel-sharing information regarding the wireless communication environment. In an exemplary embodiment, a downlink subframe is received in one or more wireless communication signals in a wireless communication environment. A preamble is detected in the downlink subframe, and at least one characteristic of the preamble is ascertained. Channel-sharing information for the wireless communication environment is determined based upon the at least one characteristic of the preamble. In another exemplary embodiment, a channel is scanned to detect secondary preambles being transmitted on the channel. A current preamble configuration, including a permutation of preamble location and preamble content corresponding to the secondary preambles, is determined, which connote channel-sharing information.Type: ApplicationFiled: October 31, 2011Publication date: February 23, 2012Applicant: WI-LAN, INC.Inventors: Paul W. Piggin, Srikanth Gummadi, Ron Porat, Kenneth L. Stanwood
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Publication number: 20110319045Abstract: Interference cancellation at a user equipment includes performing channel estimation for each component of an aggregate received signal using at least one received midamble of at least one time slot. The aggregate received signal is received from at least one Node B. A combined channel is computed for each channelization code based on the channel estimation. A linear transfer function is obtained for all user equipment within a cell. This linear transfer function includes a combined channel for each channelization code. An equalization matrix is derived from the linear transfer function and then applied to the aggregate received signal to obtain the component intended for the user equipment.Type: ApplicationFiled: May 4, 2011Publication date: December 29, 2011Inventors: Wenjun Li, Farrokh Abrishamkar, Srikanth Gummadi
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Patent number: 8064913Abstract: Methods and apparatus for identifying a subscriber station which is in motion, determining a mobility metric indicative of a level of mobility of the subscriber station and varying or updating one or more operating parameters based on the mobility metric. An apparatus can determine a measure of mobility based on one or a combination of a plurality of factors, such as variations in signal strength, variations in a channel estimate, or variations in phase or frequency of a particular signal or signal component. The one or more measures of mobility can be combined to form a single measure of mobility, the measure of mobility can be quantized to a predetermined number of mobility levels and one or more operating parameters can be varied or adjusted based on the mobility level.Type: GrantFiled: March 21, 2007Date of Patent: November 22, 2011Assignee: Wi-LAN Inc.Inventors: Srikanth Gummadi, Ron Porat, Todd R. Sutton
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Patent number: 8064444Abstract: A wireless broadcast system that collects content for distribution over a wireless communication network. At least one content stream is received and encapsulated into a stream of transport packets that are ruggedized for broadcast over the wireless communication link. The stream of transport packets are simultaneously broadcast as part of an identical signal from a plurality of synchronized transmitters in a single frequency network. The content can include multimedia data, such as audio/video data, movies, game, audio broadcasts, television network programs, or other types of multimedia content.Type: GrantFiled: January 12, 2007Date of Patent: November 22, 2011Assignee: WI-LAN Inc.Inventors: Dennis P. Connors, Brian D. Petry, Gene W. Marsh, Srikanth Gummadi, Keerthi S. Govind, William S. Burchill, Seema Madan
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Publication number: 20110268081Abstract: Systems and methods of pre-allocating identifiers to wireless devices for use in requesting resources over a random access channel are described. A wireless communication system includes a random access channel over which wireless devices can anonymously send requests for resources. The base stations receiving and processing the anonymous requests reduces the probability of random access channel collisions and conserves the resources needed to support the anonymous requests by pre-allocating one or more codes to select wireless devices. The wireless devices having the pre-allocated codes can transmit a particular code over the random access channel as a request for resources that uniquely identifies the requester.Type: ApplicationFiled: July 11, 2011Publication date: November 3, 2011Applicant: WI-LAN, INC.Inventors: Yair Bourlas, Adam E. Newham, Lei Wang, Srikanth Gummadi
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Patent number: 8050223Abstract: Enhanced frame preambles facilitate co-channel co-existence in a wireless communication environment by having at least one preamble characteristic that connotes channel-sharing information regarding the wireless communication environment. In an exemplary embodiment, a downlink subframe is received in one or more wireless communication signals in a wireless communication environment. A preamble is detected in the downlink subframe, and at least one characteristic of the preamble is ascertained. Channel-sharing information for the wireless communication environment is determined based upon the at least one characteristic of the preamble. In another exemplary embodiment, a channel is scanned to detect secondary preambles being transmitted on the channel. A current preamble configuration, including a permutation of preamble location and preamble content corresponding to the secondary preambles, is determined, which connote channel-sharing information.Type: GrantFiled: October 31, 2007Date of Patent: November 1, 2011Assignee: Wi-LAN Inc.Inventors: Paul W. Piggin, Srikanth Gummadi, Ron Porat, Kenneth L. Stanwood
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Publication number: 20110242964Abstract: The subject matter disclosed herein provides methods and apparatus, including computer program products, for detecting a preamble to enable acquisition of a downlink. In one aspect, there is provided a method. The method may include receiving a plurality of symbols. From an autocorrelation of the received symbols, a guard interval may be detected. The guard interval may represent a receive/transmit transition gap (RTG). A metric may be used to verify whether at least one symbol positioned after the detected guard interval is a preamble. Related systems, apparatus, methods, and/or articles are also described.Type: ApplicationFiled: June 14, 2011Publication date: October 6, 2011Applicant: WI-LAN INC.Inventors: Ron Porat, Yu Wen, Peter J. Graumann, Srikanth Gummadi