Li Yan

US Patent:

8477685, Jul 2, 2013

Filed:

Jul 30, 2009

Appl. No.:

12/512594

Inventors:

Li Yan - Holmdel NJ, US

Assignee:

Avaya, Inc. - Basking Ridge NJ

International Classification:

H04W 4/00
H04W 36/00
H04J 3/06
H04L 12/56

US Classification:

370328, 370349, 370352, 370401, 709245, 4554351, 455436

Abstract:

A method is disclosed that enables the transmission of media and signaling packets in a Proxy Mobile Internet Protocol-based (PMIP-based) network. A mobile access gateway is enhanced to differentiate between different types of packet traffic and to act as a Session Initiation Protocol (SIP) proxy on behalf of a mobile node. For example, the gateway is able to handle quality-of-service-sensitive (QoS-sensitive) traffic such as voice or video media packets differently from QoS-insensitive traffic such as SIP signaling packets. In the case of traffic packets that are not QoS-sensitive, the gateway engages standard PMIPv6 procedure. In the case of traffic packets that are in fact QoS-sensitive, the gateway acts as a SIP proxy for each mobile node attached to it, thereby avoiding tunneling of the packets between the gateway and the mobile node's local mobility anchor, and thereby reducing the amount of delay that affects the packets.

US Patent:

54383749, Aug 1, 1995

Filed:

Dec 10, 1993

Appl. No.:

8/165271

Inventors:

Li Yan - Holmdel NJ

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

H04N 5213

US Classification:

348620

Abstract:

Motion video is represented by digital signals. The digital signals can be compressed by coding to reduce bitspace. Noise in the signal, however, reduces the efficiency of coding. The present invention is a system and method for reducing noise in video signals by filtering. The signal for the current frame is weightedly averaged with signals for a future and prior frame. The future and prior frames are given less weight as they differ more from the current frame. When motion compensation information is available, the motion compensated future and prior frames can be used for averaging, further improving filtering.

US Patent:

55129560, Apr 30, 1996

Filed:

Feb 4, 1994

Appl. No.:

8/191685

Inventors:

Li Yan - Holmdel NJ

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

H04N 5213

US Classification:

348606

Abstract:

A 3D nonlinear postprocessing system and method are utilized to reduce coding artifacts produced by block-based motion-compensated transform coding. In the system and method, a separable 3D filtering structure is used: space-variant FIR-Median Hybrid filtering is used in spatial domain, followed by a motion-compensated nonlinear filtering in the temporal domain. By using this structure and method, the coding artifacts in a reconstructed image sequence can be effectively reduced without blurring edges or moving objects in the image sequence. Significant improvement in the picture quality of low bit-rate coded video sequences is thereby achieved.

US Patent:

56233124, Apr 22, 1997

Filed:

Dec 22, 1994

Appl. No.:

8/361929

Inventors:

Li Yan - Holmdel NJ
Barin G. Haskell - Tinton Falls NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04N 718

US Classification:

348416

Abstract:

Improved bit rate reduction techniques are disclosed. When incorporated into an existing video processing system having a DCT coefficients processor, the motion vector processor disclosed herein provides enhanced computational and memory storage efficiencies over prior art designs. The motion vector processor includes a microprocessor and associated motion vector memory. The motion vector memory is adapted to store a plurality of motion vectors corresponding to at least one image frame containing a plurality of macro blocks. Each motion vector is represented by an X value and a Y value, the X value and the Y value signifying image changes within a given macro block from a given frame to the immediately preceding frame.