Injong S Rhee

6421387, Jul 16, 2002

Aug 10, 2000

09/635614

Injong Rhee - Raleigh NC

North Carolina State University - Raleigh NC

H04B 166

37524027, 37524012, 715 18, 715 48

Real-time interactive video transmission in the current Internet has mediocre quality because of high packet loss rates. Loss of packets belonging to a video frame is evident not only in the reduced quality of that frame but also in the propagation of that distortion to successive frames. This error propagation problem is inherent in any motion-based video codec because of the interdependence of encoded video frames. Since packet losses in the best-effort Internet environment cannot be prevented, minimizing the impact of these packet losses to the final video quality is important. A new forward error correction (FEC) technique effectively alleviates error propagation in the transmission of interactive video. The technique is based on a recently developed error recovery scheme called Recovery from Error Spread using Continuous Updates (RESCU). RESCU allows transport level recovery techniques previously known to be infeasible for interactive video transmission applications to be successfully used in such applications.

7304951, Dec 4, 2007

Nov 21, 2001

09/989957

Injong Rhee - Raleigh NC, US

North Carolina State University - Raleigh NC

H04J 1/16

370235, 370253

Methods and systems for rate-based flow control between a sender and a receiver are disclosed. A receiver performs TCP-like flow control calculations based on packets received from a sender. The receiver calculates a transmission rate and forwards the transmission rate to the sender. The sender sends packets to the receiver at the rate calculated by the receiver. Thus, rather than having sender-based flow control as in TCP, the receiver controls the rate at which packets are delivered.

62890549, Sep 11, 2001

Apr 27, 2000

9/560409

Injong Rhee - Raleigh NC

North Carolina University - Raleigh NC

H04N 764
H04N 736

37524027

Methods and systems for performing packet loss recovery when transmitting compressed video over a lossy packet-based network include transmitting packets of compressed video data from a sender to a receiver. In response to detecting lost or erroneously received packets, the receiver transmits a retransmission request to the sender. In response to receiving the retransmission request, the sender changes the periodic temporal dependency distance of a frame to be transmitted such that the frame depends on the frame associated with the retransmitted packets. The receiver receives the retransmitted packets and restores the frame corresponding the retransmitted packets in a frame buffer. The receiver uses the restored frame to decode a frame transmitted after the retransmitted packets.

61047570, Aug 15, 2000

May 15, 1998

9/079621

Injong Rhee - Raleigh NC

North Carolina State University - Raleigh NC

H04B 166

375240

A new retransmission-based error control technique that does not incur any additional latency in frame playout times and is suitable for interactive video applications. This retransmission technique combined with layered video coding yields good error resilience for interactive video conferencing. The technique exploits the temporal dependency of inter-coded frames and can be easily incorporated into motion-compensation based coding standards such as MPEG and H. 261, achieving very good compression efficiency.

20190215796, Jul 11, 2019

Aug 16, 2017

16/325783

- Raleigh NC, US
Injong Rhee - Raleigh NC, US

H04W 64/00
H04W 8/22
H04W 52/24
H04B 17/327
H04B 17/336

System and method for receiving a plurality of cellular signals, determining a plurality of context data including at least one of an action data and a location data, mapping the plurality of cellular signals to the plurality of context data, generating a plurality of context signatures based on the mapping of the plurality of cellular signals to the plurality of context data, storing the plurality of context signatures, and determining a context profile associated with the communication device at an instance using a probability distribution of the stored plurality of context signatures.

20170070438, Mar 9, 2017

Sep 12, 2016

15/263309

- Raleigh NC, US
Injong Rhee - Apex NC, US

H04L 12/807
H04W 28/02
H04L 12/24

Receiver-based methods for controlling TCP sender behavior in cellular communications networks with large buffer sizes are disclosed. One method includes, at a TCP receiver, receiving packets from a TCP sender. The method further includes determining, based on the packets, a minimum round trip time and a moving average round trip time for cellular network carrying the packets between a TCP sender and a TCP receiver. The method further includes adaptably adjusting a received window size to advertise to the TCP sender based on the minimum round trip time and the moving average round trip time. The method further includes advertising the adjusted received window sizes to the TCP sender.

20150142919, May 21, 2015

May 16, 2013

14/401513

- Raleigh NC, US
Injong Rhee - Apex NC, US

H04L 29/06

709219

Smart devices including smart phones and tablets are getting more powerful and become versatile enough to replace conventional personal computers. Despite the rapid evolution of capabilities of such devices, controlling peripherals such as networked printers is infeasible due to lack of dedicated drivers to communicate with peripherals. To immediately enable smart devices to operate peripherals, a cloud-powered system, CloudBridge, is suggested. A CloudBridge application miming on a smart device works as a TCP bridge relaying packets between two TCP tunnels connected to a networked peripheral on one side and a cloud server on the other side. Through the bridge, issuing operations from a smart device without having drivers becomes possible by asking the cloud server to interpret the operations to a language that the peripheral can understand, CloudBridge further optimizes user experience by using data compression that is adaptively applied by a decision function. The system implemented in Android phones and Linux servers is demonstrated to control networked printers on smart phones and tablets. The decision function is shown to optimize QoE metrics, such as response time and energy consumption though extensive evaluations.

20140287751, Sep 25, 2014

Oct 4, 2012

14/349571

- Raleigh NC, US
Injong Rhee - Apex NC, US

H04W 48/16
H04W 48/18

455434

The subject matter described herein includes methods, systems, and computer readable media for reducing Wi-Fi scanning using cellular network to Wi-Fi access point mapping information. In one exemplary method, a mobile communications device receives Wi-Fi and cellular signals and creates or obtains a database of mappings between Wi-Fi access points and cellular network information. The mobile communications device detects signals from base stations in the cellular network. The mobile communications device determines at least one recommended access point from the data derived from the database. The mobile communications device determines whether any Wi-Fi signals are present. In response to determining that at least one Wi-Fi signal is present, the mobile communications device attempts to connect to the at least one recommended access point.