Patents by Inventor Ahmadreza Hedayat

Ahmadreza Hedayat 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: 10356627
    Abstract: An access point (AP) transmits Wi-Fi transmit frames according to a Wi-Fi protocol and Long-Term Evolution-Unlicensed (LTE-U) transmit frames according to an LTE-U protocol in a shared channel bandwidth that encompasses unlicensed channel bandwidth associated with the LTE-U protocol. The AP assigns a Wi-Fi access category to each Wi-Fi transmit frame and assigns to each LTE-U transmit frame an LTE-U access category. The AP schedules Wi-Fi and LTE-U transmit opportunities for the Wi-Fi transmit frames and the LTE-U transmit frames, respectively, in the shared channel bandwidth based on the Wi-Fi and LTE-U access categories. The scheduling includes, for each scheduled LTE-U transmit opportunity: constructing a Wi-Fi quiet message commanding Wi-Fi clients of the AP not to transmit in the shared channel bandwidth during the LTE-U transmit opportunity; and scheduling the Wi-Fi quiet message for transmission to the Wi-Fi clients.
    Type: Grant
    Filed: February 15, 2018
    Date of Patent: July 16, 2019
    Assignee: Cisco Technology, Inc.
    Inventors: Ahmadreza Hedayat, Rajesh Pazhyannur
  • Publication number: 20190037519
    Abstract: A wireless access point that serves one or more wireless client devices in a wireless network determines that at least one particular client device that is associated to the wireless access point should not be associated to the wireless access point. The wireless access point transmits frames so that they are received at the particular client device with reduced strength so as to provoke the particular client device to transition from the wireless access point.
    Type: Application
    Filed: October 3, 2018
    Publication date: January 31, 2019
    Inventors: Pooya Monajemi, Ahmadreza Hedayat, Allen J. Huotari, Jerome Henry
  • Patent number: 10165540
    Abstract: A wireless access point that serves one or more wireless client devices in a wireless network determines that at least one particular client device that is associated to the wireless access point should not be associated to the wireless access point. The wireless access point transmits frames so that they are received at the particular client device with reduced strength so as to provoke the particular client device to transition from the wireless access point.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: December 25, 2018
    Assignee: Cisco Technology, Inc.
    Inventors: Pooya Monajemi, Ahmadreza Hedayat, Allen J. Huotari, Jerome Henry
  • Publication number: 20180176791
    Abstract: An access point (AP) transmits Wi-Fi transmit frames according to a Wi-Fi protocol and Long-Term Evolution-Unlicensed (LTE-U) transmit frames according to an LTE-U protocol in a shared channel bandwidth that encompasses unlicensed channel bandwidth associated with the LTE-U protocol. The AP assigns a Wi-Fi access category to each Wi-Fi transmit frame and assigns to each LTE-U transmit frame an LTE-U access category. The AP schedules Wi-Fi and LTE-U transmit opportunities for the Wi-Fi transmit frames and the LTE-U transmit frames, respectively, in the shared channel bandwidth based on the Wi-Fi and LTE-U access categories. The scheduling includes, for each scheduled LTE-U transmit opportunity: constructing a Wi-Fi quiet message commanding Wi-Fi clients of the AP not to transmit in the shared channel bandwidth during the LTE-U transmit opportunity; and scheduling the Wi-Fi quiet message for transmission to the Wi-Fi clients.
    Type: Application
    Filed: February 15, 2018
    Publication date: June 21, 2018
    Inventors: Ahmadreza Hedayat, Rajesh Pazhyannur
  • Patent number: 9930535
    Abstract: A wireless access point (AP) configured to operate in accordance with both Wi-Fi and Long-Term Evolution (LTE-U) standards/protocols jointly schedules transmit opportunities for Wi-Fi and LTE-U frames. The AP assigns one of multiple, prioritized, Wi-Fi access categories to each Wi-Fi transmit frame based on a type of data in the transmit frame. The AP also assigns to each LTE-U transmit frame an LTE-U access category prioritized relative to the Wi-Fi access categories. The AP schedules Wi-Fi and LTE-U transmit opportunities for the Wi-Fi transmit frames and the LTE-U transmit frames, respectively, in the shared channel bandwidth based on the prioritized Wi-Fi and LTE-U access categories.
    Type: Grant
    Filed: August 5, 2014
    Date of Patent: March 27, 2018
    Assignee: Cisco Technology, Inc.
    Inventors: Ahmadreza Hedayat, Rajesh Pazhyannur
  • Patent number: 9788281
    Abstract: In one embodiment, a wireless access point that serves at least one client device in a wireless local area network transmits frames to the at least one client device so that the frames are received by the at least one client device with a receive signal strength so as to control the transmission of probe request messages by the at least one client device.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: October 10, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: Jerome Henry, Allen J. Huotari, Pooya Monajemi, Ahmadreza Hedayat
  • Patent number: 9686688
    Abstract: A Long-Term Evolution-Unlicensed (LTE-U) access point (AP) is configured to operate wirelessly on any of multiple RF channels in an unlicensed frequency band. The AP detects other LTE-U APs and Wi-Fi APs operating on active ones of the multiple channels. The AP determines AP channel statistics for each detected AP. The AP determines, for each active channel, a per-channel metric based on the AP channel statistics. The AP ranks the active channels according to the corresponding per-channel metrics, and selects a best channel on which to transmit in the unlicensed frequency band from among the ranked active channels based on the rankings.
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: June 20, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: Ahmadreza Hedayat, Rajesh Pazhyannur
  • Patent number: 9585124
    Abstract: Presented herein are techniques for using uplink transmissions from devices (e.g., wireless tags, clients, etc.) to determine a path loss between neighboring access points. In one example, a wireless controller obtains receive signal strength information of uplink transmissions received at neighboring access points in a wireless network. The wireless controller determines an effective path loss between the neighboring access points based on the receive signal strength information for the uplink transmissions received at the neighboring access points. The wireless controller also performs radio resource management operations in the wireless network using the effective path loss determined based on the uplink transmissions received at the neighboring access points.
    Type: Grant
    Filed: November 25, 2013
    Date of Patent: February 28, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: Neil R. Diener, Pooya Monajemi, Jim Florwick, Jyoti Raju, John Matthew Swartz, Ahmadreza Hedayat
  • Patent number: 9516640
    Abstract: An example method is provided in one example embodiment and may determining, by a first communication device, whether one or more other communication devices are communicating wireless signals in a particular channel of an unlicensed band of the communication network; scheduling one or more Long Term Evolution Unlicensed (LTE-U) sub-frames within a frame schedule for a user equipment (UE) based, at least in part, on determining that one or more communication devices are communicating wireless signals in the particular channel; and communicating the one or more LTE-U sub-frames to the UE according to the frame schedule.
    Type: Grant
    Filed: August 1, 2014
    Date of Patent: December 6, 2016
    Assignee: CISCO TECHNOLOGY, INC.
    Inventors: Rajesh S. Pazhyannur, Vikram Chandrasekhar, Ahmadreza Hedayat
  • Publication number: 20160095079
    Abstract: A wireless access point that serves one or more wireless client devices in a wireless network determines that at least one particular client device that is associated to the wireless access point should not be associated to the wireless access point. The wireless access point transmits frames so that they are received at the particular client device with reduced strength so as to provoke the particular client device to transition from the wireless access point.
    Type: Application
    Filed: September 25, 2014
    Publication date: March 31, 2016
    Inventors: Pooya Monajemi, Ahmadreza Hedayat, Allen J. Huotari, Jerome Henry
  • Publication number: 20160095071
    Abstract: In one embodiment, a wireless access point that serves at least one client device in a wireless local area network transmits frames to the at least one client device so that the frames are received by the at least one client device with a receive signal strength so as to control the transmission of probe request messages by the at least one client device.
    Type: Application
    Filed: September 25, 2014
    Publication date: March 31, 2016
    Inventors: Jerome Henry, Allen J. Huotari, Pooya Monajemi, Ahmadreza Hedayat
  • Publication number: 20160088631
    Abstract: A Long-Term Evolution-Unlicensed (LTE-U) access point (AP) is configured to operate wirelessly on any of multiple RF channels in an unlicensed frequency band. The AP detects other LTE-U APs and Wi-Fi APs operating on active ones of the multiple channels. The AP determines AP channel statistics for each detected AP. The AP determines, for each active channel, a per-channel metric based on the AP channel statistics. The AP ranks the active channels according to the corresponding per-channel metrics, and selects a best channel on which to transmit in the unlicensed frequency band from among the ranked active channels based on the rankings.
    Type: Application
    Filed: September 24, 2014
    Publication date: March 24, 2016
    Inventors: Ahmadreza Hedayat, Rajesh Pazhyannur
  • Publication number: 20160044516
    Abstract: A wireless access point (AP) configured to operate in accordance with both Wi-Fi and Long-Term Evolution (LTE-U) standards/protocols jointly schedules transmit opportunities for Wi-Fi and LTE-U frames. The AP assigns one of multiple, prioritized, Wi-Fi access categories to each Wi-Fi transmit frame based on a type of data in the transmit frame. The AP also assigns to each LTE-U transmit frame an LTE-U access category prioritized relative to the Wi-Fi access categories. The AP schedules Wi-Fi and LTE-U transmit opportunities for the Wi-Fi transmit frames and the LTE-U transmit frames, respectively, in the shared channel bandwidth based on the prioritized Wi-Fi and LTE-U access categories.
    Type: Application
    Filed: August 5, 2014
    Publication date: February 11, 2016
    Inventors: Ahmadreza Hedayat, Rajesh Pazhyannur
  • Publication number: 20160037490
    Abstract: An example method is provided in one example embodiment and may determining, by a first communication device, whether one or more other communication devices are communicating wireless signals in a particular channel of an unlicensed band of the communication network; scheduling one or more Long Term Evolution Unlicensed (LTE-U) sub-frames within a frame schedule for a user equipment (UE) based, at least in part, on determining that one or more communication devices are communicating wireless signals in the particular channel; and communicating the one or more LTE-U sub-frames to the UE according to the frame schedule.
    Type: Application
    Filed: August 1, 2014
    Publication date: February 4, 2016
    Applicant: CISCO TECHNOLOGY, INC.
    Inventors: Rajesh S. Pazhyannur, Vikram Chandrasekhar, Ahmadreza Hedayat
  • Patent number: 9226332
    Abstract: Techniques are presented herein for providing hybrid contention mechanisms for a wireless medium. A first wireless device (e.g., a wireless access point) that serves a plurality of second wireless devices (e.g., client devices) in a wireless network, groups the plurality of second wireless devices into sets based on commonality of the second wireless devices in terms of one or more of: power requirements and throughput requirements. A time interval on a wireless channel during which the second wireless devices may contend for usage of the wireless medium is partitioned into a plurality of disjoint or overlapping contention periods. Each set of second wireless devices is assigned to a corresponding one of the plurality of contention periods such that only second wireless devices in each set contend for access to the wireless channel during the corresponding contention period assigned to that set.
    Type: Grant
    Filed: September 12, 2013
    Date of Patent: December 29, 2015
    Assignee: Cisco Technology, Inc.
    Inventor: Ahmadreza Hedayat
  • Patent number: 9066244
    Abstract: Techniques are provided to determine whether or not incident power at a wireless communication device in at least two frequency channels is from the same device. Incident power in frequency channels allocated to a basic service set in a wireless network is received at a plurality of antennas of the wireless communication device. Channel state information is computed for at least two frequency channels allocated to the basic service set. One or more metrics are generated based on the channel state information in the two frequency channels. The one or more metrics are evaluated to characterize an uplink signal bandwidth associated with the two channels to determine whether or not the incident power in the two channels is from the same device.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: June 23, 2015
    Assignee: Cisco Technology, Inc.
    Inventors: Matthew A. Silverman, Paul J. Stager, Brian D. Hart, Mohammad Janani, Ahmadreza Hedayat
  • Patent number: 9060352
    Abstract: Techniques are provided for selecting channels for use by access points operating in a wireless local area network. Metrics are computed for at least one set of radio frequency (RF) channels, wherein the set of RF channels comprises at least two RF channels in a frequency band that are available for use by a wireless network for a wider bandwidth mode that combines bandwidth of two or more RF channels. Alignment of individual primary and secondary RF channels is determined in the set of RF channels for operation of at least first and second wireless networks. A bias is applied to the metrics for each RF channel that is a member of the set of RF channels for the primary channel depending on alignment of the primary and secondary channels of the respective first and second wireless networks to produce adjusted metrics, based on which RF channels are assigned.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: June 16, 2015
    Assignee: Cisco Technology, Inc.
    Inventors: Douglas Chan, Mansoor Ahmed, Ahmadreza Hedayat, Brian D. Hart
  • Patent number: 9059750
    Abstract: Techniques are provided to compute downlink beamforming weights for beamforming multiple spatial streams to a wireless device when that wireless device does not transmit with a maximum number of spatial streams, and thus when the full dimensional knowledge of the wireless channel to that wireless device needs to be implicitly derived. Uplink signals are received at a plurality of antennas of a first wireless device that are transmitted via a plurality of antennas of a second wireless device. The first wireless device derives values at a plurality of subcarriers of the received signals across the plurality of antennas of the first wireless device. Downlink beamforming weights are computed from values of consecutive subcarriers across the plurality of antennas of the first wireless device. The first wireless device applies the downlink beamforming weights at respective subcarriers to a number of spatial streams to be transmitted to the second wireless device.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: June 16, 2015
    Assignee: Cisco Technology, Inc.
    Inventors: Mohammad Janani, Ahmadreza Hedayat, Matthew A. Silverman
  • Publication number: 20150146543
    Abstract: Presented herein are techniques for using uplink transmissions from devices (e.g., wireless tags, clients, etc.) to determine a path loss between neighboring access points. In one example, a wireless controller obtains receive signal strength information of uplink transmissions received at neighboring access points in a wireless network. The wireless controller determines an effective path loss between the neighboring access points based on the receive signal strength information for the uplink transmissions received at the neighboring access points. The wireless controller also performs radio resource management operations in the wireless network using the effective path loss determined based on the uplink transmissions received at the neighboring access points.
    Type: Application
    Filed: November 25, 2013
    Publication date: May 28, 2015
    Applicant: Cisco Technology, Inc.
    Inventors: Neil R. Diener, Pooya Monajemi, Jim Florwick, Jyoti Raju, John Matthew Swartz, Ahmadreza Hedayat
  • Patent number: 8971273
    Abstract: Dynamic bandwidth selection techniques are provided for a plurality of wireless access point devices that operate in a wireless local area network. Each access point device is capable of serving wireless client devices with a bandwidth from a set of possible bandwidths associated with one or multiple contiguous or non-contiguous radio frequency channels. A bias is generated based on determined type of traffic or client composition for each access point device, the bias favoring a channel assignment that results in a particular bandwidth in the set of bandwidths. The bias is applied to metrics representing severity and degree of interference for each channel to generate adjusted metrics. A bandwidth from the set of possible bandwidths is selected for each access point device based on the adjusted metrics.
    Type: Grant
    Filed: October 9, 2012
    Date of Patent: March 3, 2015
    Assignee: Cisco Technology, Inc.
    Inventors: Douglas Chan, Mansoor Ahmed, Ahmadreza Hedayat, Brian D. Hart