Patents by Inventor Rojan CHITRAKAR

Rojan CHITRAKAR 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: 12232182
    Abstract: The present disclosure relates to the prioritization of devices taking part in a multi-user random access wireless communication. Based on some known conditions, devices that comply with the conditions are given preferential treatment during the random access period. The preferential treatment may refer to the eligible devices being allowed to access more resource units during the random access, or it may also mean faster access to the medium during the random access. By taking advantage of the methods described in the present disclosure, it is possible to assign higher priority to selected frame types and/or device categories in a multi-user random access wireless communication system.
    Type: Grant
    Filed: March 29, 2024
    Date of Patent: February 18, 2025
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Rojan Chitrakar, Yoshio Urabe, Lei Huang, Michael Hong Cheng Sim
  • Publication number: 20250055501
    Abstract: An access point (AP) includes a receiver, which, in operation, receives a Joint Transmission (JT) Trigger frame from another AP that indicates MAC protocol data units (MPDUs) to be jointly transmitted to a communication apparatus; and a local memory that stores one or more MPDUs previously transmitted to the communication apparatus.
    Type: Application
    Filed: October 23, 2024
    Publication date: February 13, 2025
    Inventors: Rojan CHITRAKAR, Lei HUANG, Yoshio URABE
  • Patent number: 12225533
    Abstract: The present disclosure provides communication apparatus and communication method for control signaling.
    Type: Grant
    Filed: September 10, 2020
    Date of Patent: February 11, 2025
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Lei Huang, Yoshio Urabe, Rojan Chitrakar
  • Publication number: 20250047343
    Abstract: The present disclosure provides communication apparatuses and methods for partial channel state information (CSI) feedback, the communication apparatus comprising: a receiver, which in operation, receives a measurement signal; circuitry, which in operation, is configured to measure CSI of the received measurement signal; and a transmitter, which in operation, transmits a report frame including information of a sub-component of the CSI.
    Type: Application
    Filed: October 6, 2022
    Publication date: February 6, 2025
    Inventors: Rojan CHITRAKAR, Yoshio URABE
  • Publication number: 20250039023
    Abstract: A communication apparatus includes circuitry and a transmitter. The circuitry generates a signal including one or more non-legacy long training field (LTF) symbols. Each of the one or more non-legacy LTF symbols has a plurality of data tones and a plurality of pilot tones. The circuitry maps a non-legacy LTF sequence to the plurality of data tones and the plurality of pilot tones, and groups the plurality of data tones with nonzero non-legacy LTF sequence values into a first tone group and a second tone group. The signal includes information on a number NSTS of space-time streams, wherein a total number of the one or more non-legacy LTF symbols is [NSTS/2] when 10 the NSTS is 2, 3, 4, 7, 8, 11, 12, 15 or 16; and [NSTS/2]+1 when the NSTS is 5, 6, 9, 10, 13 or 14. The transmitter, in operation, transmits the generated signal.
    Type: Application
    Filed: October 17, 2024
    Publication date: January 30, 2025
    Inventors: Lei HUANG, Yoshio URABE, Yanyi DING, Rojan CHITRAKAR
  • Publication number: 20250008574
    Abstract: A station apparatus includes a receiver and a controller. The receiver, in operation, receives a Trigger frame allocating Random Access Resource Units (RA-RUs) over multiple bands. The Trigger frame includes a User Info field that comprises a Band Indication subfield for specifying a first band among the multiple bands, an RU Allocation subfield for indicating a first RA-RU of one or more contiguous RA-RUs in the first band, and a Number of RA-RU subfield for indicating a number of the contiguous RA-RUs minus one in the first band. The controller, in operation: sets a first Orthogonal Frequency Division Multiple Access (OFDMA) random access backoff (OBO) counter to 0 if an initial value of the first OBO counter is not larger than a number of eligible RA-RUs in the first band, which is a subset of contiguous RA-RUs in the Trigger frame; and randomly selects one of the eligible RA-RUs.
    Type: Application
    Filed: September 16, 2024
    Publication date: January 2, 2025
    Inventors: Lei HUANG, Yoshio URABE, Rojan CHITRAKAR
  • Patent number: 12177023
    Abstract: Present disclosure provides a communication apparatus comprising circuitry, which, in operation, generates a first trigger frame that includes one or more user information fields, and a transmitter, which, in operation, transmits the generated trigger frame; wherein each of the one or more user information fields indicates one of more than one hybrid automatic repeat request (HARQ) feedback types.
    Type: Grant
    Filed: June 27, 2020
    Date of Patent: December 24, 2024
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Lei Huang, Yoshio Urabe, Rojan Chitrakar
  • Publication number: 20240421943
    Abstract: The present disclosure provides a communication apparatus including circuitry, which, in operation, generates a transmission signal that includes a signal field and a data field, the signal field indicating one or more user-specific allocations in the data field. An aggregate medium access control protocol data unit (A-MPDU) transmitted in each of the one or more user-specific allocations is segmented into one or more code blocks. The communication apparatus includes a transmitter, which, in operation, transmits the generated transmission signal and a receiver, which, in operation, receives a null data packet (NDP) or a medium access control (MAC) frame carrying hybrid automatic repeat request (HARQ) feedback information for the one or more code blocks.
    Type: Application
    Filed: August 30, 2024
    Publication date: December 19, 2024
    Inventors: Lei HUANG, Yoshio URABE, Rojan CHITRAKAR
  • Publication number: 20240414768
    Abstract: The communication apparatus comprises a receiver which, in operation, receives a PHY layer Data Unit that includes a duration field; Physical (PHY) layer circuitry which, in operation, issues a PHY-CCA (clear channel assessment) primitive parameter indicating bandwidth information on a busy or idle state for each subchannel within an operating bandwidth; and Media Access Control (MAC) circuitry which, in operation, updates a Network Allocation Vector (NAV) value based on the duration information and, in operation, determines busy/idle state of at least one subchannel, wherein the MAC circuitry, in operation, controls transmission of the HE TB PHY layer Data Unit based on the updated NAV value and the busy/idle state of the at least one subchannel, and controls the PHY circuitry to have the HE TB PHY layer Data Unit transmitted when the at least one subchannel is considered idle, regardless of whether the primary subchannel is busy or not.
    Type: Application
    Filed: August 23, 2024
    Publication date: December 12, 2024
    Inventors: Rojan CHITRAKAR, Lei HUANG, Yoshio URABE
  • Patent number: 12166857
    Abstract: A transmitting multi-link device (MLD) includes circuitry and a transmitter. The circuitry, in operation, constructs an Additional Authentication Data (AAD) and a Nonce, and encapsulates a plaintext medium access control (MAC) protocol data unit (MPDU), the AAD, and the Nonce to generate an encapsulated MPDU. The AAD includes an Address 1 (A1) field, to which a recipient MLD's MAC address is set, and an AAD Address 2 (A2) field, to which the transmitting MLD's MAC address is set. The Nonce includes a Nonce Address 2 (A2) field, to which the transmitting MLD's MAC address is set. The transmitter, in operation, transmits the encapsulated MPDU to the recipient MLD on a first link.
    Type: Grant
    Filed: November 28, 2023
    Date of Patent: December 10, 2024
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Rojan Chitrakar, Lei Huang, Yoshio Urabe
  • Publication number: 20240406990
    Abstract: Communication devices and methods for opportunistic WLAN sensing are provided. One exemplary embodiment provides a first communication apparatus comprising a 10 receiver, which in operation, receives a first PPDU and a second PPDU, the first PPDU indicating PHY parameters for the first PPDU and the second PPDU indicating PHY parameters for the second PPDU; and circuitry, which in operation, determines whether the PHY parameters of the first and second PPDUs are to be used for sensing based on a comparison between the first and second PPDUs, and the PHY parameters 15 of the first and second PPDUs.
    Type: Application
    Filed: August 11, 2022
    Publication date: December 5, 2024
    Inventors: Rajat PUSHKARNA, Rojan CHITRAKAR, Hong Cheng, Michael SIM, Yoshio URABE
  • Patent number: 12160283
    Abstract: An access point (AP) includes a receiver, which, in operation, receives a Joint Transmission (JT) Trigger frame from another AP that indicates MAC protocol data units (MPDUs) to be jointly transmitted to a communication apparatus; and a local memory that stores one or more MPDUs previously transmitted to the communication apparatus.
    Type: Grant
    Filed: February 27, 2020
    Date of Patent: December 3, 2024
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Rojan Chitrakar, Lei Huang, Yoshio Urabe
  • Patent number: 12155513
    Abstract: A communication apparatus includes circuitry and a transmitter. The circuitry generates a signal including one or more non-legacy long training field (LTF) symbols. Each of the one or more non-legacy LTF symbols has a plurality of data tones and a plurality of pilot tones. The circuitry maps a non-legacy LTF sequence to the plurality of data tones and the plurality of pilot tones, and groups the plurality of data tones with nonzero non-legacy LTF sequence values into a first tone group and a second tone group. The signal includes information on a number Nsrs of space-time streams, wherein a total number of the one or more non-legacy LTF symbols is [NSTS/2] when the NSTS is 2, 3, 4, 7, 8, 11, 12, 15 or 16; and [NSTS/2] +1 when the NSTS is 5, 6, 9, 10, 13 or 14. The transmitter, in operation, transmits the generated signal.
    Type: Grant
    Filed: August 4, 2020
    Date of Patent: November 26, 2024
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Lei Huang, Yoshio Urabe, Yanyi Ding, Rojan Chitrakar
  • Publication number: 20240388486
    Abstract: Communication devices and methods for preamble of aligned PPDUs are provided. One exemplary embodiment provides a first communication apparatus comprising: circuitry, which in operation, generates a first Physical Protocol Data Unit (PPDU) that is aligned with a second PPDU, wherein one or more fields of the first PPDU include one or more symbols having parameters that are different from that of one another; and a first transmitter, which in operation, transmits the first PPDU to a second communication apparatus.
    Type: Application
    Filed: September 28, 2022
    Publication date: November 21, 2024
    Inventors: Yanyi DING, Yoshio URABE, Rojan CHITRAKAR
  • Publication number: 20240388325
    Abstract: An access point (AP) includes circuitry, which, in operation, generates a frame that includes joint transmission (JT) data and a JT identity that uniquely identifies the JT data. The access point further includes a transmitter, which, in operation, transmits the frame to one or more APs that jointly transmit the JT data to a communication apparatus.
    Type: Application
    Filed: July 29, 2024
    Publication date: November 21, 2024
    Inventors: Rojan CHITRAKAR, Lei HUANG, Yoshio URABE
  • Publication number: 20240372680
    Abstract: The present disclosure provides a transmission apparatus that comprises a first payload generator configured to generate payload of a packet of a first signal type; a second payload generator configured to generate payload of a packet of a second signal type; a packet scheduler that controls the transmission timings of the first and the second packet; and a transmitter which, in operation, transmits, under the timing control of the packet scheduler, the packet of the first signal type followed by the packet of the second signal type.
    Type: Application
    Filed: July 16, 2024
    Publication date: November 7, 2024
    Inventors: ROJAN CHITRAKAR, LEI HUANG, YOSHIO URABE
  • Patent number: 12133067
    Abstract: Provided is a communication apparatus comprising a cryptographic circuitry which, in operation, uses a shared cryptographic secret Key and a cryptographic salt to generate a cryptographically encoded Message Integrity Code (MIC) that is computed over the address field of a Wake Up Radio (WUR) frame, and a transmission signal generator which, in operation, generates a secure WUR signal by replacing the address field of the WUR frame with the MIC, and a transmitter which, in operation, transmits the secure WUR signal.
    Type: Grant
    Filed: July 18, 2023
    Date of Patent: October 29, 2024
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Rojan Chitrakar, Lei Huang, Yoshio Urabe
  • Publication number: 20240348386
    Abstract: A transmission apparatus includes a transmitter and a receiver. The transmitter transmits a Trigger Frame for allocating resources for Uplink Multi User (UL MU) transmission, the Trigger Frame comprising a common information field that includes a type subfield indicating one of a plurality of trigger types, wherein the plurality of trigger types includes a first trigger type, a second trigger type and a third trigger type, the first trigger type indicating a basic trigger, the second trigger type indicating multi-user block ack request, and the third trigger type indicating a specific trigger used for soliciting a specific type of UL MU response frame from a plurality of terminal stations. The receiver, responsive to the type subfield indicating the third trigger type, receives the specific type of UL MU response frame from the plurality of terminal station.
    Type: Application
    Filed: June 27, 2024
    Publication date: October 17, 2024
    Inventors: Rojan CHITRAKAR, Lei HUANG, Yoshio URABE
  • Patent number: 12120753
    Abstract: A station apparatus includes a receiver and a controller. The receiver, in operation, receives a Trigger frame allocating Random Access Resource Units (RA-RUs) over multiple bands. The Trigger frame includes a User Info field that comprises a Band Indication subfield for specifying a first band among the multiple bands, an RU Allocation subfield for indicating a first RA-RU of one or more contiguous RA-RUs in the first band, and a Number of RA-RU subfield for indicating a number of the contiguous RA-RUs minus one in the first band. The controller, in operation: sets a first Orthogonal Frequency Division Multiple Access (OFDMA) random access backoff (OBO) counter to 0 if an initial value of the first OBO counter is not larger than a number of eligible RA-RUs in the first band, which is a subset of contiguous RA-RUs in the Trigger frame; and randomly selects one of the eligible RA-RUs.
    Type: Grant
    Filed: October 30, 2019
    Date of Patent: October 15, 2024
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Lei Huang, Yoshio Urabe, Rojan Chitrakar
  • Patent number: 12107687
    Abstract: The present disclosure provides a communication apparatus including circuitry, which, in operation, generates a transmission signal that includes a signal field and a data field, the signal field indicating one or more user-specific allocations in the data field. An aggregate medium access control protocol data unit (A-MPDU) transmitted in each of the one or more user-specific allocations is segmented into one or more code blocks. The communication apparatus includes a transmitter, which, in operation, transmits the generated transmission signal and a receiver, which, in operation, receives a null data packet (NDP) or a medium access control (MAC) frame carrying hybrid automatic repeat request (HARQ) feedback information for the one or more code blocks.
    Type: Grant
    Filed: May 28, 2020
    Date of Patent: October 1, 2024
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Lei Huang, Yoshio Urabe, Rojan Chitrakar