Patents by Inventor Koushik Das

Koushik Das 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: 11818570
    Abstract: Methods, systems, and computer readable media for message validation in fifth generation (5G) communications networks are disclosed. One method occurring at a first network node of a first network comprises: obtaining, from at least one authentication and key agreement (AKA) procedure related message associated with a user device communicating via a second network, authentication information identifying the user device; storing the authentication information in a data store for validating subsequent messages; receiving a request message associated with the user device; determining, using the authentication information, that the request message is invalid; and in response to determining that the request message is invalid, performing an invalid message action.
    Type: Grant
    Filed: December 15, 2020
    Date of Patent: November 14, 2023
    Assignee: ORACLE INTERNATIONAL CORPORATION
    Inventors: Jay Rajput, Shashikiran Bhalachandra Mahalank, Koushik Das
  • Publication number: 20220191694
    Abstract: Methods, systems, and computer readable media for message validation in fifth generation (5G) communications networks are disclosed. One method occurring at a first network node of a first network comprises: obtaining, from at least one authentication and key agreement (AKA) procedure related message associated with a user device communicating via a second network, authentication information identifying the user device; storing the authentication information in a data store for validating subsequent messages; receiving a request message associated with the user device; determining, using the authentication information, that the request message is invalid; and in response to determining that the request message is invalid, performing an invalid message action.
    Type: Application
    Filed: December 15, 2020
    Publication date: June 16, 2022
    Inventors: Jay Rajput, Shashikiran Bhalachandra Mahalank, Koushik Das
  • Publication number: 20070018248
    Abstract: Disclosed are a multi-threshold CMOS circuit and a method of designing such a circuit. The preferred embodiment combines an MTCMOS scheme and a hybrid SOI-epitaxial CMOS structure. Generally, the logic transistors (both nFET and pFET) are placed in SOI, preferably in a high-performance, high density UTSOI; while the headers or footers are made of bulk epitaxial CMOS devices, with or without an adaptive well-biasing scheme. The logic transistors are based on (100) SOI devices or super HOT, the header devices are in bulk (100) or (110) pFETs with or without an adaptive well biasing scheme, and the footer devices are in bulk (100) NFET with or without an adaptive well biasing scheme.
    Type: Application
    Filed: July 19, 2005
    Publication date: January 25, 2007
    Applicant: International Business Machines Corporation
    Inventors: Ching-Te Chuang, Koushik Das, Shih-Hsien Lo, Jeffrey Sleight
  • Publication number: 20060232321
    Abstract: A new power gating structure with robust data retention capability using only one single double-gate device to provide both power gating switch and virtual supply/ground diode clamp functions. The scheme reduces the transistor count, area, and capacitance of the power gating structure, thus improving circuit performance, power, and leakage. The scheme is compared with the conventional power gating structure via mixed-mode physics-based two-dimensional numerical simulations. Analysis of virtual supply/ground bounce for the proposed scheme is also presented.
    Type: Application
    Filed: April 15, 2005
    Publication date: October 19, 2006
    Applicant: IBM Corporation
    Inventors: Ching-Te Chuang, Koushik Das, Keunwoo Kim
  • Publication number: 20060226493
    Abstract: Discloses are CMOS circuit designs that combine MTCMOS and hybrid orientation technology to achieve the dual objectives of high performance and low standby leakage power. The invention utilizes novel combinations of a thick-oxide high-VTH PFET header with various gate- and body-biased schemes in HOT technology to significantly reduce the performance penalty associated with conventional PFET headers. A first embodiment of the invention provides a HOT-B high-VTH thick oxide bulk PFET header scheme. This header scheme can be expanded by application of a positive gate bias VPOS (VPOS>VDD) to the HOT-B PFET header during standby mode and a negative gate bias VNEG (VNEG<GND) in active mode. Another embodiment provides a HOT-A high-VTH thick oxide SOI PFET header scheme. A further embodiment provides a HOT-A body biased high-VTH thick oxide SOI PFET header scheme.
    Type: Application
    Filed: April 7, 2005
    Publication date: October 12, 2006
    Applicant: International Business Machines Corporation
    Inventors: Ching-Te Chuang, Koushik Das, Shih-Hsien Lo
  • Publication number: 20050040881
    Abstract: A multi-threshold integrated circuit (IC) with reduced subthreshold leakage and method of reducing leakage. Selectable supply switching devices (NFETs and/or PFETS) between a logic circuit and supply connections (Vdd and Ground) for the circuit have higher thresholds than normal circuit devices. Some devices may have thresholds lowered when the supply switching devices are on. Header/footer devices with further higher threshold voltages and widths may be used to further increase off resistance and maintain/reduce on resistance. Alternatively, high threshold devices may be stacked to further reduce leakage to a point achieved for an even higher threshold. Intermediate supply connects at the devices may have decoupling capacitance and devices may be tapered for optimum stack height and an optimum taper ratio to minimize circuit leakage and circuit delay.
    Type: Application
    Filed: August 20, 2003
    Publication date: February 24, 2005
    Inventors: Richard Brown, Ching-Te Chuang, Peter Cook, Koushik Das, Rajiv Joshi