MOBILE VIDEO STREAMING ENHANCEMENT IN A NETWORK CODING-CAPABLE WIRELESS NETWORK

• US 20140196065A1
• Filed: 01/07/2013
• Published: 07/10/2014
• Est. Priority Date: 01/07/2013
• Status: Active Grant

• Current Assignee: Seoul National University R&DB Foundation (Seoul National University)
• Original Assignee: Seoul National University R&DB Foundation (Seoul National University)
• Inventors: OH, Ha Young, KIM, Chong Kwon
• Granted Patent: US 9,036,497 B2
• Time in Patent Office: Days
• US Class Current: 725/14
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/2402 Monitoring of the downstream path of the transmission network, e.g. bandwidth available traffic monitoring in data switching networks H04L43/00; monitoring data switching networks utilization H04L43/0876
• CPC Class Codes: H04N 21/6131 involving transmission via a mobile phone network wireless downlink channel access H04W74/006
• CPC Class Codes: H04N 21/6379 directed to encoder , e.g. for requesting a lower encoding rate
• CPC Class Codes: H04N 21/64738 Monitoring network characteristics, e.g. bandwidth, congestion level data switched network analysis H04L41/14; monitoring functioning in data switched networks H04L43/0817; flow control in packet networks H04L47/10
• CPC Class Codes: H04N 21/64761 directed to the server

Abstract

A method of mobile video streaming according to an exemplary embodiment of the present invention includes three parts. The first part is for AP to measure the information of all clients such as ETX (Expected Transmission count metric) and RSSI (Receive Signal Strength Indicator) periodically for long-term channel quality and mobility patterns of each client. In the second part, AP estimates the buffer status, short-term channel quality, and mobility detection of each client based on only feedback from the target client and first part result. And lastly, AP performs a practical online scheduling to select the best network code set satisfying high Peak Signal-to-Noise Ratio (PSNR), a standard metric of video quality, during a GoP (Group of Picture) at all clients based on I-frame priority.

Claims

1. A method for mobile video streaming comprising:

measuring information of a plurality of clients periodically for long-term channel quality and mobility patterns of each client;

estimating buffer status, short-term channel quality, and mobility of each client based on only feedback from a target client; and

performing an online scheduling to select a best network code set satisfying high Peak Signal-to-Noise Ratio (PSNR), a standard metric of video quality, during a GoP (Group of Picture) at all of the plurality of clients based on I-frame priority.

2. The method of claim 1, wherein the information includes ETX (Expected Transmission count metric) and RSSI (Receive Signal Strength Indicator).

3. The method of claim 1, wherein the best network code set is selected utilizing Eq. (1) and Eq. (4) below.

4. The method of claim 2, wherein the estimating short-term channel quality comprises utilizing the feedback from the target client for updating ETX of the target client as short term channel quality.

5. The method of claim 2, wherein the estimating mobility comprises:

predicting the mobility based on each L2 triggers occurred when the calculated RSSI of received beacon is smaller than the predefined RSSI threshold; and

calculating possible locations of the target client.